Sam (61 kg) and Alice (44 kg) stand on an ice rink, providing them with a nearly frictionless surface to slide on. Sam gives Alice a push, causing her to slide away at a speed (with respect to the rink) of 1.20 m/s.
a) With what speed does Sam recoil?
b) Calculate the change in the kinetic energy of the Sam- Alice system.
c) Energy cannot be created or destroyed. What is the source of the final kinetic energy of this system?
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