Mass m1 = 2.02 kg is connected to mass m2 = 1.5 kg as shown in the diagram above. Both masses start from rest and are moving with a speed of 2.52 m/s just before m2 hits the floor. If the coefficient of kinetic friction is μk = 0.216, how much conservative work (in joules) was done on this system? Report your answer as a positive number.