A body of mass $10\, kg$ is lying on a rough plane inclined at an angle of $30^o$ to the horizontal and the coefficient of friction is $0.5$. the minimum force required to pull the body up the plane is ........ $N$
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(b) $F = mg(\sin \theta + \mu \cos \theta )$
$ = 10 \times 9.8(\sin 30^\circ + 0.5\cos 30^\circ ) = 91.4\;N$.
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