Question

Does the train go faster when it goes up the hill or down the hill

Answer 1

Difference in impact during uphill and downhill running. When going down ahill, running is (at least initially) easier, since gravity is doing some of the work to move you forward. The downside is that you have to absorb significantly more shock on impact.

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Answer 2

the train go faster when it down the hills because then the gravity works on the train and it is easily to come down the hill because in this condition the train is also coming down and the gravity also works in the downward direction so it is easily to down the but in the opp world case then the train is going about but the direction of the gravity is downwards so it is hard

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