Two blocks, A and B (with mass 50.0 kg and 1.00 × 102 kg, respectively), are connected by a string, as shown in Figure P5.86. The pulley is frictionless and of negligible mass. The coefficient of kinetic friction between block A and the incline is μk = 0.250. Determine the change in the kinetic energy of block A as it moves from to , a distance of 20.0 m up the incline (and block B drops downward a distance of 20.0 m) if the system starts from rest.
to 
, a distance of 20.0 m up the incline (and block B drops downward a distance of 20.0 m) if the system starts from rest.
