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?
(a) Zero (b) Positive
(c) Negative (d) Nothing can be said
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Answer:
zero
Explanation:
Its because work done dW = F.dS = FdS cos(angle between force of gravity and displacement)
= FdS cos(90°) = FdS(0) = 0
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