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A block of mass 1kg slides down a curved...

A block of mass `1kg` slides down a curved track which forms one quadrant of a circle of radius `1m` as shown in figure. The speed of block at the bottom of track is `v=2 ms^(-1)`. The work done by the of friction is
.

A

`8J`

B

`-8J`

C

`4J`

D

`-4J`

Text Solution

Verified by Experts

The correct Answer is:
B
`W_("friction") = K.E_(f)-P.E_(i)`
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