A hockey puck (m = 170. g and v0 = 2.0 m/s) slides without friction on the ice and hits the rink board at 30° with respect to the normal. The puck bounces off the board at a 40° angle with respect to the normal. What is the coefficient of restitution for the puck? What is the ratio of the puck's final kinetic energy to its initial kinetic energy?
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