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A railroad car of mass 2.00 x 10^4 kg is traveling north 6.00 m/s and collides with a railroad car of mass 1.50 x 10^4 kg traveling south 4.00 m/s.
A) Find the velocity of the railroad cars that become coupled after the collision.
B) Find the velocity of railroad cars if the lighter car is intially at rest.
What are direction and magnitude of total velocity
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