When an athlete takes part in a long jump he runs for a while and then jumps. This is because:
inertia of motion helps him to take a longer jump.
running for a time makes him alert.
it helps him to focus on the point of jump.
he can apply more force for the jump after running.
The correct option is A inertia of motion helps him to take a longer jump.
The inertia helps him to retain his horizontal speed and hence the athlete can jump with a greater horizontal velocity to cover a longer distance.