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Magnitude of Block Movement

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Block 1, of mass = 3.30, moves along a frictionless air track with speed = 31.0. It collides with block 2, of mass = 15.0 , which was initially at rest. The blocks stick together after the collision

A.) Find the magnitude of the total initial momentum of the two-block system.
Express your answer numerically.

B.) Find, the magnitude of the final velocity of the two-block system.
Express your answer numerically.

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