Posted by Jen on Thursday, January 19, 2012 at 10:43pm.
A 49.4 kg swimmer is standing on a stationary 214 kg floating raft. The swimmer then runs off the raft horizontally with a velocity of +3.60 m/s relative to the shore. Calculate the magnitude of the recoil velocity that the raft would have if there were no resistance due to the water.

physics  drwls, Thursday, January 19, 2012 at 11:50pm
Use the fact that total momentum remains zero.
49.4 * 3.60 + 214 * Vraft = 0
Solve for Vraft
The negative sign will mean it goes backwards.