A block has been placed on an inclined p...

A block has been placed on an inclined plane . The slope angle of `theta` of the plane is such that the block slides down the plane at a constant speed . The coefficient of kinetic friction is equal to :

` sin theta`

` cos theta`

` tan theta`

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The correct Answer is:

( c) Force of friction is zero. Only contact force is normal reaction which is mg cos theta.

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