In the system of Figure 5-52, x(r) is the input displacement and 0(t) is the output angular displacement. Assume that the masses involved are negligibly small and that all motions are restricted to be small; therefore, the system can be considered linear. The initial conditions for x and 8 are zeros, or x(0-) = 0 and 8(0-) = 0. Show that this system is a differentiating element. Then obtain the response (t) when x() is a unit-step input. L No friction