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Two blocks are on a frictionless surface. One block is at rest and the other collides...

Two blocks are on a frictionless surface. One block is at rest and the other collides with it at 25 m/s in the +x-direction. Both blocks have the same mass. The first block flies off at +45-degrees to the +x-axis and the other flies off at -45-degrees to the +x-axis.

What is the magnitude of the velocity of the two pucks? Assume that this is an elastic collision.  

Draw a diagram to support your answer.

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