When an athlete takes part in a long jump he runs for a while and then jumps. This is because:

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The inertia of motion helps him to take a long jump

Running for a time makes him alert.

It helps him to focus on the point of the jump.

He can apply more force for the jump after running.

answer is A.

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Detailed Solution

When an athlete tries to jump from the rest position, he needs to apply force to overcome the inertia of rest. Due to this, he cannot take a very long jump.
Whereas when the athlete runs before taking a long jump, he is already in forward motion and has an inertia of motion.
We know that an object in motion tries to remain in its state of motion.
Therefore, due to inertia of motion, the athlete continues to be in forward motion even after jumping and thus is able to take a long jump.

Hence, we can say that an athlete can take a long jump when he runs before jumping because the inertia of motion helps him to take a long jump.

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