One car of mass 150kg is moving 500ms to the right on a, Ask an Expert

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One car of mass 15.0kg is moving 5.00m/s to the right on a frictionless track and collides with a cart of mass 3.00kg. the final velocity of the carts that become stuck together after the collision is 1.50m/s to the right. find the velocity of the second cart before the collision.

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