Question

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

Answer 1

because of the gravity
the train will go faster when it come down to the hill

Answer 2

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$<h1><i><b><center>Speed</center></h1>$

speed of train is faster when it goes down the hill

$<h2><center><i><marquee>Hope it helps</center></h2>$