Solve the following :


A block of mass $1 \mathrm{~kg}$ is placed at the point $A$ of a rough track shown in figure (8-E6). If slightly pushed towards right, it stops at the point B of the track. Calculate the work done by the frictional force on the block during its transit from $A$ to $B$.


Work done = change in P.E.


$W=1 \times 10 \times(0.8-1)$

$W=-2 \mathrm{~J}$

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