NEET Work, Energy and Power PYQs | 2013–2025

2025

Q1. A body of mass 2 kg is moving with a velocity of 5 m/s. Calculate its kinetic energy.

Q2. A force of 10 N is applied to move a body through a distance of 5 m. What is the work done?

Q3. A person lifts a 10 kg box vertically by 3 m. Find the work done by the person.

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2024

Q1. Define power and derive the relation between power, work, and time.

Q2. A body of mass 4 kg moves with velocity 3 m/s. Calculate the kinetic energy of the body.

Q3. If a force of 20 N acts on a body for 10 s and displaces it by 15 m, find the work done and power delivered.

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2023

Q1. A car of mass 1000 kg is moving at a velocity of 36 km/h. Calculate the kinetic energy of the car.

Q2. A force of 50 N is applied to a body, and it moves through a displacement of 8 m in the direction of the force. Find the work done.

Q3. A machine does 1000 J of work in 10 s. Find its power.

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2022

Q1. A body of mass 5 kg is thrown vertically upward with a velocity of 10 m/s. Find the work done against gravity.

Q2. A 10 kg body is lifted by a person through a height of 10 m. What is the work done by the person?

Q3. A car engine produces a power of 75 kW. How much work is done by the engine in 1 minute?

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2021

Q1. A block of mass 5 kg is raised to a height of 4 m. Calculate the potential energy of the block.

Q2. If a person does 300 J of work in 2 minutes, calculate the power generated.

Q3. A person applies a force of 10 N to a box and moves it through a horizontal distance of 5 m. What is the work done on the box?

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2020

Q1. A body of mass 2 kg is moving with a velocity of 6 m/s. Find its kinetic energy.

Q2. A person pushes a box with a force of 15 N and moves it a distance of 4 m. Calculate the work done.

Q3. If a machine uses 100 J of work in 10 s, calculate its power.

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2019

Q1. A body of mass 10 kg is moving with a speed of 20 m/s. Calculate its kinetic energy.

Q2. A person does 500 J of work in 10 seconds. Find the power generated by the person.

Q3. A 100 W motor operates for 5 minutes. How much work is done by the motor?

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2018

Q1. A body is moving with a velocity of 8 m/s. If its mass is 4 kg, calculate its kinetic energy.

Q2. A man lifts a box of mass 20 kg through a height of 2 m. Calculate the work done.

Q3. A person applies a force of 25 N to a box and moves it a distance of 10 m. Calculate the work done on the box.

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2017

Q1. A body of mass 2 kg moves with a velocity of 5 m/s. Find its kinetic energy.

Q2. A force of 12 N acts on a body for 8 s, and the displacement is 16 m. Calculate the work done and power delivered.

Q3. A body of mass 3 kg is lifted by 4 m. Find the potential energy of the body.

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2016

Q1. A 2 kg body is moving with a velocity of 10 m/s. Calculate its kinetic energy.

Q2. A person lifts a box of mass 5 kg through a height of 3 m. Calculate the work done against gravity.

Q3. A car engine delivers 80 kW of power. How much work is done by the engine in 1 minute?

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2015

Q1. A body of mass 3 kg moves with a velocity of 4 m/s. Calculate the kinetic energy.

Q2. A person applies a force of 50 N to move a box through a distance of 3 m. Find the work done.

Q3. A machine performs 1500 J of work in 10 s. Find the power delivered by the machine.

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2014

Q1. A body of mass 6 kg is lifted through a height of 5 m. Find the potential energy of the body.

Q2. A force of 30 N moves a body through a distance of 6 m. Calculate the work done.

Q3. A person does 200 J of work in 4 seconds. Find the power.

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2013

Q1. A body of mass 8 kg is moving with a velocity of 2 m/s. Calculate its kinetic energy.

Q2. A force of 12 N is applied to move a body a distance of 3 m. What is the work done?

Q3. A machine generates 500 J of work in 5 seconds. Find the power delivered by the machine.

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Work, Energy, and Power — Solutions (2025 → 2013)

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2025

Q1. Kinetic Energy (KE)
Given:

• Mass $m = 2 \, \text{kg}$m=2kg
• Velocity $v = 5 \, \text{m/s}$v=5m/s

$$KE = \frac{1}{2} m v^2 = \frac{1}{2} \times 2 \times 5^2 = 25 \, \text{J}$$KE=21​mv2=21​×2×52=25J

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Q2. Work Done (W)
Given:

• Force $F = 10 \, \text{N}$F=10N
• Displacement $s = 5 \, \text{m}$s=5m

$$W = F \times s = 10 \times 5 = 50 \, \text{J}$$W=F×s=10×5=50J

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Q3. Work Done in Lifting a Box
Given:

• Mass of box $m = 10 \, \text{kg}$m=10kg
• Height $h = 3 \, \text{m}$h=3m
• Gravitational acceleration $g = 10 \, \text{m/s}^2$g=10m/s2

$$W = mgh = 10 \times 10 \times 3 = 300 \, \text{J}$$W=mgh=10×10×3=300J

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2024

Q1. Power Formula Derivation
Power $P$P is the rate at which work is done, or energy is transferred:$$P = \frac{W}{t} = \frac{F \times s}{t}$$P=tW​=tF×s​

Where $W$W is work, $F$F is force, $s$s is displacement, and $t$t is time.

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Q2. Kinetic Energy
Given:

• Mass $m = 4 \, \text{kg}$m=4kg
• Velocity $v = 3 \, \text{m/s}$v=3m/s

$$KE = \frac{1}{2} m v^2 = \frac{1}{2} \times 4 \times 3^2 = 18 \, \text{J}$$KE=21​mv2=21​×4×32=18J

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Q3. Work Done and Power
Given:

• Force $F = 20 \, \text{N}$F=20N
• Time $t = 10 \, \text{s}$t=10s
• Displacement $s = 15 \, \text{m}$s=15m

Work done:$$W = F \times s = 20 \times 15 = 300 \, \text{J}$$W=F×s=20×15=300J

Power:$$P = \frac{W}{t} = \frac{300}{10} = 30 \, \text{W}$$P=tW​=10300​=30W

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2023

Q1. Kinetic Energy of a Car
Given:

• Mass $m = 1000 \, \text{kg}$m=1000kg
• Velocity $v = 36 \, \text{km/h} = 10 \, \text{m/s}$v=36km/h=10m/s

$$KE = \frac{1}{2} m v^2 = \frac{1}{2} \times 1000 \times 10^2 = 50000 \, \text{J}$$KE=21​mv2=21​×1000×102=50000J

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Q2. Work Done by a Force
Given:

• Force $F = 50 \, \text{N}$F=50N
• Displacement $s = 8 \, \text{m}$s=8m

$$W = F \times s = 50 \times 8 = 400 \, \text{J}$$W=F×s=50×8=400J

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Q3. Power Delivered by a Machine
Given:

• Work done $W = 1000 \, \text{J}$W=1000J
• Time $t = 10 \, \text{s}$t=10s

$$P = \frac{W}{t} = \frac{1000}{10} = 100 \, \text{W}$$P=tW​=101000​=100W

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2022

Q1. Work Done Against Gravity
Given:

• Mass $m = 5 \, \text{kg}$m=5kg
• Initial velocity $u = 10 \, \text{m/s}$u=10m/s
• Gravitational acceleration $g = 10 \, \text{m/s}^2$g=10m/s2

At maximum height, the work done against gravity is equal to the potential energy:$$PE = mgh = 5 \times 10 \times 10 = 500 \, \text{J}$$PE=mgh=5×10×10=500J

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Q2. Work Done in Lifting a 10 kg Body
Given:

• Mass $m = 10 \, \text{kg}$m=10kg
• Height $h = 10 \, \text{m}$h=10m
• Gravitational acceleration $g = 10 \, \text{m/s}^2$g=10m/s2

$$W = mgh = 10 \times 10 \times 10 = 1000 \, \text{J}$$W=mgh=10×10×10=1000J

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Q3. Work Done by a Car Engine
Given:

• Power $P = 75 \, \text{kW} = 75000 \, \text{W}$P=75kW=75000W
• Time $t = 1 \, \text{minute} = 60 \, \text{seconds}$t=1minute=60seconds

Work done:$$W = P \times t = 75000 \times 60 = 4500000 \, \text{J}$$W=P×t=75000×60=4500000J

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2021

Q1. Potential Energy of a Block
Given:

• Mass $m = 5 \, \text{kg}$m=5kg
• Height $h = 4 \, \text{m}$h=4m
• Gravitational acceleration $g = 10 \, \text{m/s}^2$g=10m/s2

$$PE = mgh = 5 \times 10 \times 4 = 200 \, \text{J}$$PE=mgh=5×10×4=200J

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Q2. Power Generated by a Person
Given:

• Work $W = 300 \, \text{J}$W=300J
• Time $t = 2 \, \text{minutes} = 120 \, \text{seconds}$t=2minutes=120seconds

$$P = \frac{W}{t} = \frac{300}{120} = 2.5 \, \text{W}$$P=tW​=120300​=2.5W

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Q3. Work Done on a Box
Given:

• Force $F = 10 \, \text{N}$F=10N
• Displacement $s = 5 \, \text{m}$s=5m

$$W = F \times s = 10 \times 5 = 50 \, \text{J}$$W=F×s=10×5=50J

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2020

Q1. Kinetic Energy of a Body
Given:

• Mass $m = 2 \, \text{kg}$m=2kg
• Velocity $v = 6 \, \text{m/s}$v=6m/s

$$KE = \frac{1}{2} m v^2 = \frac{1}{2} \times 2 \times 6^2 = 36 \, \text{J}$$KE=21​mv2=21​×2×62=36J

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Q2. Work Done on a Box
Given:

• Force $F = 15 \, \text{N}$F=15N
• Displacement $s = 4 \, \text{m}$s=4m

$$W = F \times s = 15 \times 4 = 60 \, \text{J}$$W=F×s=15×4=60J

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Q3. Power of a Machine
Given:

• Work done $W = 100 \, \text{J}$W=100J
• Time $t = 10 \, \text{s}$t=10s

$$P = \frac{W}{t} = \frac{100}{10} = 10 \, \text{W}$$P=tW​=10100​=10W

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2019

Q1. Kinetic Energy of a Body
Given:

• Mass $m = 10 \, \text{kg}$m=10kg
• Velocity $v = 20 \, \text{m/s}$v=20m/s

$$KE = \frac{1}{2} m v^2 = \frac{1}{2} \times 10 \times 20^2 = 2000 \, \text{J}$$KE=21​mv2=21​×10×202=2000J

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Q2. Power Generated by a Person
Given:

• Work $W = 500 \, \text{J}$W=500J
• Time $t = 10 \, \text{s}$t=10s

$$P = \frac{W}{t} = \frac{500}{10} = 50 \, \text{W}$$P=tW​=10500​=50W

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Q3. Work Done by a Motor
Given:

• Power $P = 100 \, \text{W}$P=100W
• Time $t = 5 \, \text{minutes} = 300 \, \text{seconds}$t=5minutes=300seconds

$$W = P \times t = 100 \times 300 = 30000 \, \text{J}$$W=P×t=100×300=30000J

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2018

Q1. Kinetic Energy of a Body
Given:

• Mass $m = 4 \, \text{kg}$m=4kg
• Velocity $v = 8 \, \text{m/s}$v=8m/s

$$KE = \frac{1}{2} m v^2 = \frac{1}{2} \times 4 \times 8^2 = 128 \, \text{J}$$KE=21​mv2=21​×4×82=128J

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Q2. Work Done by Lifting a Box
Given:

• Mass $m = 20 \, \text{kg}$m=20kg
• Height $h = 2 \, \text{m}$h=2m
• Gravitational acceleration $g = 10 \, \text{m/s}^2$g=10m/s2

$$W = mgh = 20 \times 10 \times 2 = 400 \, \text{J}$$W=mgh=20×10×2=400J

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Q3. Work Done on a Box
Given:

• Force $F = 25 \, \text{N}$F=25N
• Displacement $s = 10 \, \text{m}$s=10m

$$W = F \times s = 25 \times 10 = 250 \, \text{J}$$W=F×s=25×10=250J

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2017

Q1. Kinetic Energy of a Body
Given:

• Mass $m = 2 \, \text{kg}$m=2kg
• Velocity $v = 5 \, \text{m/s}$v=5m/s

$$KE = \frac{1}{2} m v^2 = \frac{1}{2} \times 2 \times 5^2 = 25 \, \text{J}$$KE=21​mv2=21​×2×52=25J

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Q2. Work Done and Power Delivered
Given:

• Force $F = 12 \, \text{N}$F=12N
• Displacement $s = 16 \, \text{m}$s=16m
• Time $t = 8 \, \text{s}$t=8s

Work Done:$$W = F \times s = 12 \times 16 = 192 \, \text{J}$$W=F×s=12×16=192J

Power Delivered:$$P = \frac{W}{t} = \frac{192}{8} = 24 \, \text{W}$$P=tW​=8192​=24W

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Q3. Potential Energy of a Body
Given:

• Mass $m = 3 \, \text{kg}$m=3kg
• Height $h = 4 \, \text{m}$h=4m
• Gravitational acceleration $g = 10 \, \text{m/s}^2$g=10m/s2

$$PE = mgh = 3 \times 10 \times 4 = 120 \, \text{J}$$PE=mgh=3×10×4=120J

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2016

Q1. Kinetic Energy of a Body
Given:

• Mass $m = 2 \, \text{kg}$m=2kg
• Velocity $v = 10 \, \text{m/s}$v=10m/s

$$KE = \frac{1}{2} m v^2 = \frac{1}{2} \times 2 \times 10^2 = 100 \, \text{J}$$KE=21​mv2=21​×2×102=100J

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Q2. Work Done in Lifting a Box
Given:

• Mass $m = 5 \, \text{kg}$m=5kg
• Height $h = 3 \, \text{m}$h=3m
• Gravitational acceleration $g = 10 \, \text{m/s}^2$g=10m/s2

$$W = mgh = 5 \times 10 \times 3 = 150 \, \text{J}$$W=mgh=5×10×3=150J

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Q3. Work Done by Car Engine
Given:

• Power $P = 80 \, \text{kW} = 80000 \, \text{W}$P=80kW=80000W
• Time $t = 1 \, \text{minute} = 60 \, \text{seconds}$t=1minute=60seconds

$$W = P \times t = 80000 \times 60 = 4800000 \, \text{J}$$W=P×t=80000×60=4800000J

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2015

Q1. Kinetic Energy
Given:

• Mass $m = 3 \, \text{kg}$m=3kg
• Velocity $v = 4 \, \text{m/s}$v=4m/s

$$KE = \frac{1}{2} m v^2 = \frac{1}{2} \times 3 \times 4^2 = 24 \, \text{J}$$KE=21​mv2=21​×3×42=24J

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Q2. Work Done by a Person
Given:

• Force $F = 50 \, \text{N}$F=50N
• Displacement $s = 3 \, \text{m}$s=3m

$$W = F \times s = 50 \times 3 = 150 \, \text{J}$$W=F×s=50×3=150J

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Q3. Power Delivered by a Machine
Given:

• Work done $W = 1500 \, \text{J}$W=1500J
• Time $t = 10 \, \text{s}$t=10s

$$P = \frac{W}{t} = \frac{1500}{10} = 150 \, \text{W}$$P=tW​=101500​=150W

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2014

Q1. Potential Energy of a Body
Given:

• Mass $m = 6 \, \text{kg}$m=6kg
• Height $h = 5 \, \text{m}$h=5m
• Gravitational acceleration $g = 10 \, \text{m/s}^2$g=10m/s2

$$PE = mgh = 6 \times 10 \times 5 = 300 \, \text{J}$$PE=mgh=6×10×5=300J

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Q2. Work Done
Given:

• Force $F = 30 \, \text{N}$F=30N
• Displacement $s = 6 \, \text{m}$s=6m

$$W = F \times s = 30 \times 6 = 180 \, \text{J}$$W=F×s=30×6=180J

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Q3. Power
Given:

• Work $W = 200 \, \text{J}$W=200J
• Time $t = 4 \, \text{seconds}$t=4seconds

$$P = \frac{W}{t} = \frac{200}{4} = 50 \, \text{W}$$P=tW​=4200​=50W

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2013

Q1. Kinetic Energy
Given:

• Mass $m = 8 \, \text{kg}$m=8kg
• Velocity $v = 2 \, \text{m/s}$v=2m/s

$$KE = \frac{1}{2} m v^2 = \frac{1}{2} \times 8 \times 2^2 = 16 \, \text{J}$$KE=21​mv2=21​×8×22=16J

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Q2. Work Done
Given:

• Force $F = 12 \, \text{N}$F=12N
• Displacement $s = 3 \, \text{m}$s=3m

$$W = F \times s = 12 \times 3 = 36 \, \text{J}$$W=F×s=12×3=36J

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Q3. Power Delivered by a Machine
Given:

• Work $W = 500 \, \text{J}$W=500J
• Time $t = 5 \, \text{seconds}$t=5seconds

$$P = \frac{W}{t} = \frac{500}{5} = 100 \, \text{W}$$P=tW​=5500​=100W