I A rectangular prism (mass M = 4 kg, height = 0.5 m) is at rest on a frictionless horizontal plane. There is a second similarly shaped prism (mass m = 1 kg, height = 0.25 m) positioned on the inclined plane of the first prism and this is also at rest. There is no friction between the prisms. A spring with spring constant 80 N/m and undeformed length L = H = 0.5 m is connecting the two prisms. At t = 0, the system is in situation I (top figure). II H/2 60 60 H