Two people, one with mass m1 and the other with mass m2, stand on a stationary sled with mass M on a frozen lake. Assume that the ice is frictionless. a) The first person (with mass m1) jumps off the sled with a velocity −sxˆ relative to the (stationary) sled. What is his velocity? Use conservation of momentum to find the velocity of the sled (which is still carrying the second person).