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A block of mass 10kg is placed on a roug...


A block of mass `10kg` is placed on a rough surface inclined plane of inclination `37^@` with horizontal. Now the block is released . The work done by the gravitational force and friction force, when the block moves from A to `B(sin37^@=0.6`,`cos37^@=0.8)`

A

600J, 160J

B

`-600J`,`160J`

C

600J, `-600J`

D

`-600J`,`-600J`

Text Solution

Verified by Experts

The correct Answer is:
C

Work done by gravitational force is
`mgsinthetad=10xx10xxsin37^@xx10=600J`
Work done by friction is
`-fd=-mumgcosthetad`
`=-0.2xx10xx10xxcos37^@xx10`
`=-20xx(4)/(5)xx10=-160J`
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