Question

why does an athlete runs a certain distance before taking a leap?
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Answer 1

Answer:

The inertia of motion helps an athlete to gain the momentum that would help him to take a long jump. ... This external force is gained by an athlete by running for a certain distance horizontally, in turn, which increases the kinetic energy of that athlete.

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Answer 2

An athlete runs before taking a leap to gain momentum because it helps in jumping higher and longer because of the inertia of motion gained due to 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. While running, the athlete cannot gain energy or apply larger force because initially, he would be rest and while running, he will lose energy.