55 kg swimmer is standing on a stationary 225 kg floating raft. The swimmer then runs off the raft horizontally with a velocity of +4.4 m/s relative to the shore. Find the recoil velocity that the raft would have if there were no friction and resistance due to the water. I used the equation vf2=-m1*vf1 divided by m2, but the answer is wrong. Did I use the wrong equation? Please Help!!!