A Force F acts on a body and displaces i...

A Force F acts on a body and displaces it by a distance S in direction at an angle `theta` with the direction of force ,(a) Write the expression for the work done by the force,(b)What should be the angle between the force and displacement so that the work done is (i)zero ,(ii)Maximum ?

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(a) F S cos `theta` ,(b) (i)`90^(@)` (ii)`0^(@)`

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