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Explain why people using parachute flex their legs while landing.

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When parachutists land, they keep their knees bent and roll over all in an effort to lengthen the period of the force of impact, thus reducing its effects.

When the parachutist first makes contact with the ground, they have a certain speed. Soon, their speed will be zero. That means they have an acceleration
which must be caused by the force on them
F = ma

If they hit the ground stiff-legged, then their speed goes to zero very quickly.  is small,  is large, and  is large. Large forces can cause injuries.

But if they bend their knees and roll, then they've increased their interaction time with the ground.  is larger,  is smaller, and  is smaller. Smaller forces are less likely to cause injuries.
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