A hockey goalie in full gear has a mass of 100kg a 0145 kg, Ask an Expert

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A hockey goalie in full gear has a mass of 100.kg. A 0.145 kg puck is shot at him with a veloctiy of 49m/s.

A) How fast must the goalie skate out so that he does not move backwards once he makes the save?

b) Would this be an elastc or inelastic collison? Explain?

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