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Work done by gravitational force on a fr...

Work done by gravitational force on a freely falling body ………….

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Workdone `W = vec(F)* vec(S) = FS cos theta " where " theta ` smaller angle between force `vec(F) ` and displace- ment `vec(S)`
The bucket moves in a direction opposite to the gravitational force which acts vertically downwards.
`theta = 180^(@)`
`W = FS cos 180^(@) = - FS` . It is negative
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