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A ball falls to the ground as shown belo...

A ball falls to the ground as shown below :

(a) What is the kinetic energy of ball when it hits the ground ?
(b) What is the potential energy of ball at B ?
(c) Which law you have made use of in answering this question ?

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The correct Answer is:
(a) 80 J (b) 32 J (c) Law of conservation of energy
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LAKHMIR SINGH & MANJIT KAUR-WORK AND ENERGY-Exercise
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  2. The following data was obtained for a body of mass 1 kg dropped from a...

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  3. A ball falls to the ground as shown below : (a) What is the kinet...

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  4. In an experiment to measure his power, a student records the time take...

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  5. In loading a truck, a man lifts boxes of 100 N each through a height o...

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  6. Name the energy transfers which occur when : (a) an electric bell ri...

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  7. A force of 7 N acts on an object. The displacement is, say 8 m, in the...

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  8. When do we say that work is done ?

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  9. Write an expression for the work done when a force is acting on an obj...

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  10. Define 1 J of work.

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  11. A pair of bullocks exerts a force of 140 N on a plough. The field bei...

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  12. What is the kinetic energy of an object ?

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  13. Write an expression for kinetic energy of an object.

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  14. The kinetic energy of an object of mass m moving with a velocity of 5 ...

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  15. What is power ?

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  16. Define 1 W of power.

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  17. A lamp consumes 1000 J of electrical energy is 10 s. What is its power...

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  18. Define avarage power.

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  19. Look at the activites listed below. Reason out whether or not work is ...

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  20. An object thrown at a certain angle to the ground moves in a curved pa...

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