A railroad car that has an inertia of 10 Mg is moving to the right at 5.0 m/s when it collides and couples with three railroad cars that are identical to it.   Before the collision, the three railroad cars are already coupled together and are moving to the right at 1.0 m/s.   a) What is the final velocity of the four railroad car system after the collision?   b) If the collision takes 1.00 s, what is magnitude of the average acceleration, aave (in m/s2), of the 10 Mg railroad car during the collision?   c) How much energy is dissipated in the collision?

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