Question: Superman must stop 120-km/h a train in 150 m to keep it from hitting a stalled car on the tracks. If the train's mass is

Superman must stop 120-km/h a train in 150 m to keep it from hitting a stalled car on the tracks. If the train's mass is 3.6 × 105 kg, how much force must he exert? Compare to the weight of the train (give as %). How much force does the train exert on Superman?

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