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9. Work and energy
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Q15 of 28 Page 159

A free-fall object eventually stops on reaching the ground. What happens to its kinetic energy?

As kinetic energy becomes zero on reaching the ground it gets converted into various forms of energy, Like heat energy due to impact with ground and due to air resistance with the object.


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Why does a person standing for a long time get tired when he does not appear to be doing any work.

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What is kinetic energy? Derive an equation for the kinetic energy of a body of mass ‘m’ moving at a speed ‘v’.

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A man carrying a bag of total mass 25kg climbs up to a height of 10m in 50 seconds. Calculate the power delivered by him on the bag.

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A 10 kg ball is dropped from a height of 10m. Find

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Questions · 28
9. Work and energy
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