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These questions consists of two statements each printed as Assertion and Reason. While answering these question you are required to choose any one of the following four responses
Assertion A body of mass 10 kg is placed on a rough inclined surface `(mu=0.7)`. The surface is inclined to horizontal at angle `30^(@)`. Acceleration of the body down the plane will be zero.
Reason Work done by friction is always negative.

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Correct Answer - C
( c) `mg sin theta=10xx10xx(1)/(2)=50N`
`mu mg cos theta=0.7xx10xx10xx(sqrt(3))/(2)=60.62N`

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