Which would take more force to stop in 17.3 seconds: a 3.2 kg ball rolling in a straight line at a speed of 0.3 m/sec or a 4.1 kg ball rolling along the same path at a speed of 1.2 m/sec?

Ben (55kg) is standing on very slippery ice when junior (25kg) bumps into him. junior was moving at a speed of 8 m/s before the collision and ben and junior embrace after the collision. find the speed of ben and junior as they move across the ice after the collision. give the answer in m/s. describe the work you did to get the answer.