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2014-11-25T09:38:19+05:30

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W = F Cos Ф  * s
         F = force (vector) applied on an object.,        s = displacement (vector)
         Ф = angle between the force and displacement vectors.

   Cos Ф gives the component of force along the direction that the body is displaced.
   ie.,  F Cos Ф and s are in the same direction.

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