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A body is being raised to a height h fro...

A body is being raised to a height h from the surface of earth. What is the sign of work done by
(a) applied force (b) gravitational force ?

Text Solution

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From `W=Fs cos theta`, (a) for applied force `theta =0^(@), cos theta =cos 0^(@)=1`. `:. W=` positive , and
(b) for gravitational force, `theta=180^(@), cos theta =cos 180^(@)=-1`
`W=` negative.
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