Question

give reason. an athlete in long jump runs a distance before taking the leap

Answer 1

so that the frictional force will make his speed more and he will jump higher

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.