(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A parachutist of mass 80 kg approaches the ground at 5 m/s. Suppose that when he hits the ground, he decelerates at a constant rate (while his legs buckle under him) over a distance of 1 m. What is the force the ground exerts on his feet during the deceleration?

2. Relevant equations

[tex] \vec{F} = m \vec{a} [/tex]

3. The attempt at a solution

I think a lot of this information is extraneous. Isn't the force that the ground exerts on the parachutist going to be opposite his weight?

So, [tex] \vec{F} = mg = (80 * 9.8) = 784 [/tex] N

I'm not sure about this because it seems odd that all of that extra information would be given if it is not needed.

Thanks in advance.

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# Homework Help: Dynamics and Free Fall

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