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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
.

Text Solution

Verified by Experts

The correct Answer is:
B
`mg1+w_(fk)=(1)/(2)(1)2^(2)-0`
`w_(fk)=2-10`
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Knowledge Check

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

    A
    `8J`
    B
    `-8J`
    C
    `4J`
    D
    `-4J`

  • 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`

  • A body of mass 2kg slides down a curved track which is quadrant of a circle of radius 1 metre . All the surfaces are frictionless. If the body starts from rest, its speed at the bottom of the track is

    A
    4.43m/sec
    B
    2m/sec
    C
    0.5m/sec
    D
    19.6m/ec

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