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  4. A body of mass 1 kg is shifted from A to D on inclined planes by applying a force slowly such that the block is always in contact with the plane surfaces. Neglecting the jerk experienced at points C and B, total work done by the force is:

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Q. A body of mass $1 \,kg$ is shifted from $A$ to $D$ on inclined planes by applying a force slowly such that the block is always in contact with the plane surfaces. Neglecting the jerk experienced at points $C$ and $B$, total work done by the force is:Physics Question Image

Work, Energy and Power

Solution:

Work done:
$=M g h_{1}+M g h_{2}+M g h_{3}+\mu_{1} M g l_{1}+\mu_{2} M g l_{2}+\mu 3 M g l_{3}$
$=M g\left(h_{1}+h_{2}+h_{3}\right)+M g\left(\mu_{1} l_{1}+\mu_{2} l_{2}+\mu_{3} l_{3}\right) $
$=M g(8+0.2+0.4+0.4) $
$=90 \,J$