Ice-hockey star Wayne Gretzky is skating at 12.2 m/s toward adefender, who in tr

Question

Ice-hockey star Wayne Gretzky is skating at 12.2 m/s toward adefender, who in trun is skating at 4.15 m/s toward Gretzky.Gretzky’s weight is 612 N; that of the defender is 884 N.Immediately after the collision, Gretzky is moving at 1.11 m/s inhis original direction. You can ignore external horizontal forcesapplied by the ice to the skaters during the collision. What is thevelocity of the defender immediately after the collision?
Hint: Take Gretzky’s initial direction as the positivevelocity. Ice-hockey star Wayne Gretzky is skating at 12.2 m/s toward adefender, who in trun is skating at 4.15 m/s toward Gretzky.Gretzky’s weight is 612 N; that of the defender is 884 N.Immediately after the collision, Gretzky is moving at 1.11 m/s inhis original direction. You can ignore external horizontal forcesapplied by the ice to the skaters during the collision. What is thevelocity of the defender immediately after the collision?
Hint: Take Gretzky’s initial direction as the positivevelocity.

Explanation / Answer

mass of each player: Gretzky mass = 612 / 9.81 = 62.4 kg defender mass = 884 / 9.81 = 90 kg use conservation of momentum                             pg + pd = pg' +pd' (62.4)(12.2) + (90)(-4.15) = (62.4)(1.11) + 90v                  761.28- 373.5 = 69.2 +90v                                               v =   3.5 m/s in same direction asgretzky                   

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