A small body of mass m is located on a horiiontal plane at
the point 0. The body acquires a horizontal velocity vo. Find:
(a) the mean power developed by the friction force during the
whole time of motion, if the friction coefficient k = 0.27, m = 1.0 kg,
and 1), = 1.5 m/s;
(b) the maximum instantaneous power developed by the friction
force, if the friction coefficient varies as k = ax, where a is a constant,
and x is the distance from the point 0.