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

A block of mass 1 kg slides down a vertical curved track that is one quadrant of a circle of radius 1m. Its speed ast the the bottom si `2 m//s`. The work done by frictional force is :

A

`8 J`

B

`-8 J`

C

`4 J`

D

`-4 J`

Text Solution

Verified by Experts

The correct Answer is:
B
`mg1 + W_(k) = (1)/(2) (M)2_(2) = 0`
`W_(fk) = 2 - 10`.
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