Two pucks are on a frictionless surface.  One puck is at rest and the other collides with it at 25 m/s in the +x-direction.  The pucks have the same mass.  The first puck flies off at +30-degrees to the +x-axis and the other flies off at -30-degrees to the +x-axis.   What is the magnitude of the velocity of the two pucks?  Assume that this is an elastic collision.

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