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27 December, 22:22

A hockey puck of mass m1=165 g slides from left to right with an initial velocity of 15.5 m/s. It collides head on with a second puck of the same mass, m2=m1, moving in the opposite direction with velocity - 21.5 m/s. They collide elastically head-on. After the collision, the velocity of m2 is: (in m/s)

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