four railroad cars each of mass 2.50 x 10^4 kg are coupled together and coasting

Question

four railroad cars each of mass 2.50 x 10^4 kg are coupled together and coasting along horizontal tracks at speed v initial toward the south. a very strong but foolish movie actor, riding on the second car uncouples the front car and gives it a big push, increasing its speed to 4.00 m/s southward. the remaining three cars continue moving south now at 2.00 m/s (a) find the initioal speed of the four cars. (b) how much work did the actor do? (c) state the relationship between the process described herer and the process in problem 8.15.

Explanation / Answer

a) (4*1 + 2*3)/4 = 2.5m/s b) .5 * (2.5 x 104) (4*4 + 3* 2*2) - .5 * (2.50 x 104 * 4) * 2.5 *2.5 = 37500 J

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