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Q.

A body of mass 10 kg is dropped to the ground from a height of 10 metres. The work done (in J) by the gravitational force is  (g=9.8 m/sec2)

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answer is 980.

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Detailed Solution

As the body moves in the direction of force therefore work done by gravitational force will be positive.W=Fs=mgh=10×9.8×10=980J
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