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A man drops a 10 kg rock from the top of...

A man drops a 10 kg rock from the top of a 20 m ladder. What will be its kinetic energy when it reaches the ground ? What will be its speed just before it hits the ground ? Does the speed depend on the mass of the rock ?

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MBD-WORK, ENERGY AND POWER-Example
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  3. A man drops a 10 kg rock from the top of a 20 m ladder. What will be i...

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  9. A car of 1000 kg moving with a velocity of 30 m//s stops with uniform ...

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  10. A car is moving with a speed of 54 km//h. What will be the kinetic ene...

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  11. 1 Joule of energy is used for one heart beat. Calculate the power of t...

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  12. State the relation between commercial unit of energy and joules.

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  13. How much work is done on a body of mass 1 kg whirling on a circular pa...

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  14. What is the SI unit of power ?

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  15. A ball is thrown vertically upwards. Its velocity keeps on decreasing....

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  16. If the heart works 60 joules in one minute, what is its power ?

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  17. Name the term used for the sum of kinetic energy and potential energy ...

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  18. How many joules are present in 1 kilowatt hour?

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  19. What should be the change in velocity of a body required to increase i...

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  20. Under what conditions the work done by a force is zero in spite of dis...

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