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OpenStudy (anonymous):

Block 1 of mass m1 slides along a frictionless floor and into a one-dimensional elastic collision with stationary block 2 of mass m2 = 2.0m1. Prior to the collision, the center of mass of the two-block system had a speed of 4.0 m/s. Afterward, what are the speeds of (a) the center of mass and (b) block 2? a. 4m/s b.?

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