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

Options

A. zero
B. `mgvt cos^(2) theta`
C. `mvgt sin^(2) theta`
D. `mgvt sin 2 theta`

Answer

A

Explanation

Since block does not slide on wedge so displacement is zero & hence work done by force is zero.