text: physics help? you weighing 50 kg were standing sheet of ice (ignoring friction) and you threw a 1 kg baseball at a velocity of 25 m/s what would your recoil velocity be?  imagine 3 astronauts were outside the space shuttle enjoying a zero gravity enviroment.  if two of them played a game of catch using the third astronaut as the ball, what would happen as this game continued? conservation of momentum: m1*v1=m2*v2 so 50kg*v=1kg*25m/s, v is 0.5m/s  how cruel :) they would move apart, total momentum is still zero, energy conservation valid due to the fact that they use their bio energy