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Mathematics 20 Online
OpenStudy (anonymous):

A hockey puck of mass m traveling along the x axis at 4.5 m/s hits another identical hockey puck at rest. If after the collision the second puck travels at a speed of 3.5 m/s at an angle of 30° above the x axis, what is the final velocity of the first puck?

OpenStudy (irishboy123):

conservation of momentum......again big clue is they're identical

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