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What is meant by Work Done by a Constant Force ?

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Let a constant force F be applied on the body such that it makes an angle θ with the horizontal and body is displaced through a distance s. 

Then work done by the force in displacing the body through a distance s is given by

W = (F cos θ) s = Fs cos θ 

⇒ W = (F cos θ) s = Fs cos θ

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