A railroad car of mass 2.50 x 104 kg is moving with a speed of 4.00 m/s. It collides and
couples with three other coupled railroad cars, each of the same mass as the single car and
moving in the same direction with an initial speed of 2.00 m/s.
(a) What is the speed of the four cars after the collision?
(b) How much mechanical energy is lost in the collision?
Four railroad cars, each of mass 2.50 x 104 kg, are coupled together and coasting along horizontal tracks at some speed vi. Superman, riding on the second car, uncouples the very front car and gives it a big push, increasing its speed in the same direction to 4.00 m/s. The remaining three cars continue moving in the same direction, now at 2.00 m/s.
1 answer
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