A block of mass m is sliding down an inclined plane with constant speed. At a certain instant t0, its height above the ground is h. The coefficient of kinetic friction between the block and the plane is µ. If the block reaches the ground at a later instant tg, then the energy dissipated by friction in the time interval (tg – t0) is–
(A) µmgh
(B) µmgh/sinθ
(C) mgh
(D) µmgh/cosθ
