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(a) What do you understand by the kineti...

(a) What do you understand by the kinetic energy of a body ?
(b) A body is thrown vertically upwards. Its velocity goes on decreasing. What happens to its kinetic energy as its velocity becomes zero ?
(c) A horse and a dog are running with the same speed. If the weight of the horse is ten times that of the dog, what is the ratio of their kinetic energies ?

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The correct Answer is:
(b) Kinetic energy becomes zero (c) `10 : 1`
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LAKHMIR SINGH & MANJIT KAUR-WORK AND ENERGY-Exercise
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  2. (a) Define the term 'energy' of a body. What is the SI unit of energy....

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  3. (a) What do you understand by the kinetic energy of a body ? (b) A b...

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  4. (a) Explain by an example what is meant by potential energy. Write dow...

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  5. (a) What is the difference between gravitational potential energy and ...

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  6. A car is accelerated on a lavelled road and attains a velocity 4 times...

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  7. A car is accelerated on a lavelled road and attains a speed of 4 times...

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  8. In case of negative work, the angle between the force and displacement...

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  9. An iron sphere of mass 10 kg has the same diameter as an aluminium sph...

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  10. A girl is carrying a school bag of 3 kg mass on her back and moves 200...

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  11. The work done on an object does not depend on the :

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  12. Water stored in a dam possesses

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  13. The momentum of a bullet of mass 20 g fired from a gun is 10 kg.m/s. T...

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  14. Each of the following statement describes a force acting. Which force ...

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  15. A girl weighing 400 N climbs a vertical ladder. If the value of g be 1...

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  16. Which of the following does not possess the ability to do work not bec...

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  17. A stone is thrown upwards as shown in the diagram. When it reaches P, ...

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  18. A boy tries to push a truck parked on the roadside. The truck does not...

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  19. The work done by a force acting obliquely is given by the formula : W ...

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  20. What should be the angle between the direction of motion of a body so ...

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