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Two frictionless carts collide and stick together in a perfectly inelastic collision, due to a magnetic...

Two frictionless carts collide and stick together in a perfectly inelastic collision, due to a magnetic or mechanical coupling, on a one-dimensional track. Cart 1 has mass 200 grams and an initial velocity of 2 m/s. Cart 2 has mass 900 g, and is initially stationary. What is the velocity of the two carts together after the collision?

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