Q.

A man starts walking from a point on the surface of earth (assumed smooth) and reaches diagonally opposite point. What is the work done by him

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a

Zero

b

Positive

c

Negative

d

Nothing can be said

answer is A.

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Detailed Solution

As surface is smooth so work done against friction is zero. Also the displacement and force of gravity are perpendicular so work done against gravity is zero.
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