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A 20 kg block is moving to the right at 15 m/s along a horizontal frictionless...

A 20 kg block is moving to the right at 15 m/s along a horizontal frictionless road when it collides with a 40 kg block moving to the right at 5 m/s. After the collision, the 20 kg mass is moving to the right at 12 m/s. Find the velocity of the 40 kg mass after the collision.

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