statics

Question: A body of weight W rests on a rough plane, whose coefficient of friction is $\mu (=\tan \lambda )$ which is inclined at an angle $\alpha $ with the horizon. The least force required to pull the body up the plane is



1) $2\,W\sin (\alpha +\lambda )$
2) $W\sin (\alpha +\lambda )$
3) $\,W\sin (\alpha -\lambda )$
4) $2\,W\sin (\alpha -\lambda )$
Solution: Explanation: No Explanation
Friction

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