Two blocks, A and B (with mass 50 kg and 100 kg, respectively), are connected by a string as shown in the figure. The pulley is frictionless and negligible in mass. The coefficient of kinetic friction between block A and the incline is μk = 0.25. Determine the change in the kinetic energy of block A as it moves from C to D, a distance of 20.0 m up the incline (and block B drops downward a distance of 20 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.
