Starting from rest, two skaters "push off" against each other on smooth level ice, where friction is negligible. The mother's mass is 77 kg and the...

Starting from rest, two skaters "push off" against each other on smooth level ice, where is negligible. The mother's mass is 77 kg and the child's is 53 kg. If the mother moves away with a  of 3.3 m/s, find the "recoil" velocity of the child in m/s.