Question

why when an athelete comes running from a distance he is able to jump longer

Answer 1

because it increases the momentum of the athlete and helps him to make a more high jump.

Answer 2

An athlete runs before jumping to gain momentum. Because it helps in jumping higher and longer because of inertia of motion gained due to the motion. When the athletes Jump they already have a forward motion that would be greater than that of a jump made from standing in one spot.
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