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IMPORTANT
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N s is the unit of momentum. In SI system it can be identified as

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Important Questions on Work and Energy

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9th CBSE
IMPORTANT
Core Science Physics For Class 9>Chapter 4 - Work and Energy>EXERCISE>Q 3
A boy lifts a body of 25 kg and then puts it back. To calculate work done by him, he must know:
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9th CBSE
IMPORTANT
Core Science Physics For Class 9>Chapter 4 - Work and Energy>EXERCISE>Q 4
A truck and a car have same momentum. The kinetic energy of the car is:
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9th CBSE
IMPORTANT
Core Science Physics For Class 9>Chapter 4 - Work and Energy>EXERCISE>Q 5
A cyclist and a scooterist have same kinetic energy. The scooterist will have
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Core Science Physics For Class 9>Chapter 4 - Work and Energy>EXERCISE>Q 6
The kinetic energy of an object of mass m, moving with a velocity of 5 m s-1 is 25 J. If the velocity is increased by three times, the kinetic energy is:
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9th CBSE
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Core Science Physics For Class 9>Chapter 4 - Work and Energy>EXERCISE>Q 7
A body of mass 20 kg, slows down from 5 ms-1 to 2 ms-1 by a retarding force. The work done by the force is
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Core Science Physics For Class 9>Chapter 4 - Work and Energy>EXERCISE>Q 8
An object of mass m is moving with a constant velocity v. The work done on the object to bring it to rest is :
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9th CBSE
IMPORTANT
Core Science Physics For Class 9>Chapter 4 - Work and Energy>EXERCISE>Q 9
A car of mass 1500 kg is moving with a velocity of 60 km h-1. The work done by its brakes to bring it to rest is :
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Core Science Physics For Class 9>Chapter 4 - Work and Energy>EXERCISE>Q 10
A locomotive exerts a force of 7500 N and pulls a train by 1.5 km. The work done by the locomotive in mega joules is: