A railroad car coasting towards the right at a speed of 5 m/s runs into a set of three other cars initially at rest and couples with them. All four cars are identical. (a) What is the speed of the coupled set after the impact? (b) Assume that the coupled set continues to move at the same speed until it runs into bumpers at the end of the track. The bumpers bring the convoy to rest in 0.2 s. What is the average force exerted by the track bumpers? Each car has a mass of 20,000 kg.

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