(a) What happens to the work done when t...

(a) What happens to the work done when the displacement of a body is at right angles to the direction of force acting on it ? Explain your answer.
(b) A force of 50 N acts on a body and moves it a distance of 4 m on a horizontal surface. Calculate the work done if the direction of force is at an angle of `60^(@)` to the horizontal surface.

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(b) 100 J

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