Spring-Mass System with no damping (b=0) 3. Find the differential equation that represents the motion of the spring-mass system described below. A mass (object) weighing 128 Ib stretches a spring 2 ft. Use g=32 ft/sec?. 1 4. Suppose the mass (object) is released with an initial position x(0) = 3 ft and initial velocity x'(0) =1 ft/sec . Determine the position x(t) of the mass at any time t. 5. Find the frequency , period , and amplitude of the motion. Fill in the blanks with your values and include units in these answers