A block is kept on an inclined plane of inclination `theta` of length l. the velocity of particle at the bottom of inclined is (the coefficient of friciton is `mu`)
A. `sqrt(2gl(mucostheta-sintheta))`
B. `sqrt(2gl(sintheta-mucostheta))`
C. `sqrt(2gl(sintheta+mu cos theta))`
D. `sqrt(2gl(costheta+mu sin theta))`