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Q.

A body of mass 0.1kg released from a height of 50m reaches the ground with a velocity of 10 ms−1 . The work done against air resistance is (g=10 ms−2)

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a

5 J

b

50 J

c

0

d

45 J

answer is D.

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Detailed Solution

W=mgh−12mv2      =0.1×10×50−12×0.1×100=45 J
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A body of mass 0.1kg released from a height of 50m reaches the ground with a velocity of 10 ms−1 . The work done against air resistance is (g=10 ms−2)