A thread holds two carts together on a frictionless surface. A compressed spring acts on the carts. After the thread is burned,

Question

A thread holds two carts together on a frictionless surface. A compressed spring acts on the carts. After the thread is burned, the 1.5-kg cart moves with a velocity of 27 cm/s to the left. What is the velocity of the 4.5-kg cart, in cm/s?

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