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Q.

A ball of mass 100g is projected upward with an initial velocity 10ms−1 and comes back and finally achieved a velocity of  5ms−1 at the point of projection. The work done by air resistance

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a

3.75 J

b

0.375J

c

-3.75 J

d

-0.375 J

answer is D.

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Detailed Solution

W=ΔK.EWg+Wair =KEf−KEi0+Wair =12×100×10−352−102Wair =12×10−1×−75=−3.75J
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