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If you lift a body to aheight h with a f...

If you lift a body to aheight h with a force that is equal to the weight of a body,how much work is done and if you lift it with a force that is greater than the weight of a body,where does the extra energy go ?

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PHYSICS GALAXY - ASHISH ARORA-WORK, ENERGY AND POWER-Discussion Question
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  13. Why is ittiring to hold a heavy weight eventhough no work is done ?

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  15. Consider the situation - A laborer carrying bricks on his head on a le...

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  16. Does the work done by a force depend on the frame of reference ?

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