A small body of mass m lies on a horizontal plane. The body is given a velocity `v_0`, along the plane. (a) Find the mean power developed by the friction during the whole time of motion, if friction coefficient is `mu = 0.3, m = 2.0 kg` and `v_0` = 3 m/s. (b) Find the maximum instantaneous power developed by the friction force, if the friction coefficient varies as `mu =alphax`, where `alpha` is a constant and x is distance from the starting point

Answer

(a) -9 watt
(b) `1/2 mv_(0)^(2) sqrt(alphag)`