Two skaters standing motionless are facing each other in the
middle of the skating rink. One has a mass of 91 kg and the other
has a mass of 57 kg. The two skaters place their palms together and
push. By observing the side of the rink, the first skater
determines that he is moving to the right at 0.75 m/s. What is the
velocity of the second skater, who is moving to the left? Ignore
friction