Suppose your three friends and you are on a square shaped raft. You all have jumped mutually perpendicularly into the river from the raft at velocity 2m/s at the same time. What will be the velocity of the center of mass of the raft?
Maybe,the law of conservation of momentum will help.
The Attempt at a Solution
Not sure how to do that,because the mass of the four guy and the raft isn't mentioned.So how can I deal with it?