A small block of mass m is kept on a rou...

A small block of mass m is kept on a rough inclined surface of inclination `theta` fixed in an elevator. The elevator goes up with a uniform velocity v and te block does not slide n te wedge. The work done by the force of friction on the block in time t will be

Zero

`mg vt cos^(2) theta`

`mg vt sin^(2) theta`

`mg vt sin 2 theta`

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