When you jump from an elevated position you usually bend your knees upon reaching the ground.By doing this,you make the time of the impact about 10 times as great as for a stiff-legged landing.In this way the average force your body experiences is

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By bending your knees, you increase the time over which the impact occurs, which reduces the average force experienced by your body to about 1/10 as great, according to the impulse-momentum theorem.

When You Jump from an Elevated Position You Usually Bend