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In each of the following a force, F is a...

In each of the following a force, F is acting on an object of mass, m. The direction of displacement is from west to east shown by the longer arrow. Observe the diagrams carefully and state whether the work done by the force is negative, positive or zero.

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(a) no displacement
(b) force is positive (work is done)
(c) work done is negative
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