(II) Two crates, of mass M1 = 38 kg and M2 = 82 kg, are in contact and at rest on a horizontal surface See Fig. A 288-N push force is exerted from the left. If the coefficient of kinetic Fpush M1 M2 friction is 0.14, calculate (a) the acceleration of the system, and (b) the force that crate M1 exerts on M2 and (c) Repeat with the crates reversed