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(a) What is the difference between gravi...

(a) What is the difference between gravitational potential energy and elastic potential energy ? Give one example of a body having gravitational potential energy and another having elastic potential energy.
(b) If 784 J of work was done in lifting a 20 kg mass, calculate the height through which it was lifted. (`g = 9.8 m//s^(2)`)

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The correct Answer is:
(b) 4 m
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LAKHMIR SINGH & MANJIT KAUR-WORK AND ENERGY-Exercise
  1. (a) What do you understand by the kinetic energy of a body ? (b) A b...

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

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

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

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

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

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

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

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

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  10. Water stored in a dam possesses

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

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

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

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

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

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

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

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

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  19. In which of the following case of work done by a force will be maximum...

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  20. How much work is done by the gravitational force of earth acting on a ...

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