A block of mass M is pulled along a horizontal surface by applying a force at angle `theta` with the horizontal. The friction coefficient between the block and the surfasce is `mu`. If the block travels at a uniform velocity, find the work donen by this applied force during a displacement d of the blcok.

Options

A. `(mu gs)/(cos theta + sin theta)`
B. `(mu mgs cos theta)/(cos theta + mu sin theta)`
C. `(mu gs sin theta)/(cos theta+ mu sin theta)`
D. `(mu g s cos theta)/(cos theta- mu sin theta)`

Answer

B