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A block of mass 2 kg is released from re...

A block of mass `2 kg` is released from rest on a rough inclined ground as shown in figure. Find the work done on the block by a) gravity b) force of friction .when the block is displaced downward along the plane by 2m ?
.
(Take `g 10 m//s^(2)`).

Text Solution

Verified by Experts

The correct Answer is:
A, B, C, D
`W_(mg) =(mg)(S) cos 30^@`
`=(20)(2)(sqrt(3//2))`
`=34.6 J`
.
(b) `W_fS cos180^@`
`=(mumg cos theta) (S) (-1)`

`=-(1/2) (20) (cos 60^@) (2)`
`=-10 J`.
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