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A block of mass 1 kg is placed at the point A of a rough track shown in the figure. If slightly pushed towards right, it stops at the point B of the track. The work done by the frictional force on the block during its transit from A to B is

A

`-2J`

B

`-4J`

C

`2J`

D

`4J`

Text Solution

Verified by Experts

The correct Answer is:
A

`K_A+U_A=K_B+U_B+W_f`
`0+mg(1)=0+mg(0.2)+W_f`
`W_f=mg(0.2)=1xx10xx0.2=2J`
`W_f:` work done against friction
`W_f^(')=-W_f=-2J`
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