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A body of mass m was slowly hauled up th...

A body of mass m was slowly hauled up the hill as shown in the fig. by a force F which at each point was directed along a tangent to the trajectory. Find the work performed by this force, if the height of the hill is h, the length of its base is I and the coefficient ot friction is `mu`.
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Text Solution

Verified by Experts

The correct Answer is:
`A=mg(h+kl)`
For slowly havled `DeltaK=0`
`W_(F)+W_(g)+W_(f)=DeltaK`
`W_(g)=-mgh`
`W_(f)=-mgkl`
`W_(F)=mgh+mgkl=mgl(h+kl).`
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