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A .50 kg hockey puck moving at a speed of 5.70 m/s collides with a stationary hockey puck of equal mass. After the collisions, the first puck moves off in a direction 60 degrees to the left of its original direction, while the second puck moves off at a right angle to the first puck. What is the speed of the second puck after the collision?

I know that I have to solve for the components, but I'm not sure which numbers to use to solve for it.