A block of mass m slides down a rough in...

A block of mass m slides down a rough inclined plane of inclination `theta` with horizontal with zero initial velocity. The coefficient of friction between the block and the plane is `mu` with `theta gt tan^(-1)(mu)`. Rate of work done by the force of friction at time t is

`mumg^(2)tsintheta`

`mg^(2)t(sintheta-mucostheta)`

`mumg^(2)tcostheta(sintheta-mucostheta)`

`mumg^(2)tcostheta`

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