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Q.

Work done by a force on an object is zero when


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a

Displacement of an object is in the direction of force

b

Displacement of an object is in the opposite direction

c

Displacement is along a zig-zag path

d

Displacement is perpendicular to the direction of force 

answer is D.

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Detailed Solution

This is because when the displacement of a body is perpendicular to the direction of force applied then work done is zero. Therefore if a person tries to push a wall then he is applying force and the wall does not move. So, the displacement of the wall is zero. Hence, work done is zero.
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