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Question

A block of mass 1 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 .8 of the track. Calculate the work done by the frictional force on the block during its transit from A to B.

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Solution

Given,m=1kg,H=1m,h=0.8m

Here ,work done by friction

=change in P.E.

[as the body comes to rest]

W1=mghmgH

1×10(0.81)

=1×10×(0.2)=2J


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