1. The problem statement, all variables and given/known data Four 63kg bobsledders psuh their sled which has a mass of 210kg when empty. They start to push over a flat frictionless surface at an initial speed of 3m/s. At intervals of 2s, each bobsledder sprints forwards at a speed of 2m/s faster than the sled's current speed and then jumps in. What is the sled's final speed once everyone is in? 2. Relevant equations p'=p 3. The attempt at a solution m1v1=v(mtotal) m1 is sled's mass.