An open-link chain of length L = 8 m with a mass of 48 kg is resting on a smooth horizon...

An open-link chain of length L = 8 m with a mass of 48 kg is resting on a smooth horizontal surface when end A is doubled back on itself by a force P applied to end A. (a) Calculate the required value of P to give A a constant velocity of 1.5 m/s. (b) Calculate the acceleration a of end A if P = 20 N and if v = 1.5 m/s when x = 4 m.