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No work is done by a force on an object ...

No work is done by a force on an object if

A

the fore is always perpendicular to its velocity

B

the force is always perpendicular to its acceleration

C

the object is stationary but the point of applicaton of the force moves on the object

D

the object moves in such a way that the point of aplication of the forces remains fixed.

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The correct Answer is:
A, C, D
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