Two blocks of mass mA and mB, resting on africtionless table, are connected by a stretched spring and then released. (a) Is there a net external force on the system? (b) Determine the ratio of their speeds, vA/vB. (c) What is the ratio of their kinetic energies? (d) Describe themotion of the CM of this system. (e) How would the presence off riction alter the above results?