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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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Case (i):
 
In this case, the direction of force functioning on the object is  to the displacement. Therefore, work done by force on the object are going to be .
 
Case (ii):
 
In this case, the direction of force functioning on the object is  of displacement. Therefore, work done by force on the object are going to be .
 
Case (iii):
 
In this case, the direction of force on the object is  of displacement. Therefore, work done by force on the object are going to be .