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A 16 gram mass is moving in + x-direction at 30 cm/s, while a 4.0 gram...

A 16 gram mass is moving in + x-direction at 30 cm/s, while a 4.0 gram mass is moving in the -x direction at 50 cm/s. They collided head on and stick together. Find their velocity after collision. Assume negligible friction.

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