Question

A hockey puck of mass m traveling along the xaxis 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 xaxis, what is the final velocity of the first puck?
A) 1.0 m/s, 30 below the x axis
B) 2.3 m/s, 50 below the x axis
C) 2.8 m/s, 60 below the x axis
D) 3.0 m/s, 45 below the x axis
E) not enough information

Answer

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