Question there is a broken bridge in the path of a train, Ask an Expert

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Question: There is a broken bridge in the path of a train moving at 20 m/s. A person inside the train sees this and realizes that he needs to jump out from the back side of the train in order to escape from death. The broken bridge is 50m away from the train and the person is 15m far from the back end of the train. At what speed must he run towards the back end of the train so as to jump from it just when the train reaches the broken bridge?

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