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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

Verified by Experts

Work done by applied force is postive as the displacement is in the direction of applied force
` :. " " theta = 0^(@) rArr W = Fh cos 0^(@)` Fh (positive )
(b) Work done by gravitational force is negative as the displacement is opposite to the direction of gravitational force , `theta = 180^(@)`
`rArr " "W = Fh cos 180^(@) = - Fh ` (negative )
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