How Does Bending Knees Reduce Impact Force in a Jump?

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AI Thread Summary
Bending the knees during a jump helps reduce impact force and prevent injuries associated with landing stiff-legged. A 72.6 kg man jumping at a speed of 6.35 m/s experiences significant force if he lands without bending his knees, coming to a stop in just 2.19 ms. To calculate the average net force acting on him, one must first determine the average acceleration using the formula Δv / Δt. The discussion highlights the importance of understanding the physics behind landing techniques to minimize injury risk. Proper calculations and application of the force equation F=ma are essential for solving the problem effectively.
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Homework Statement


When jumping straight down, you can be seriously injured if you land stiff-legged. One way to avoid injury is to bend your knees upon landing to reduce the force of the impact. A 72.6 kg man just before contact with the ground has a speed of 6.35 m/s. In a stiff-legged landing he comes to a halt in 2.19 ms. Calculate the average net force that acts on him during this time.


Homework Equations





The Attempt at a Solution


I don't even know how to start this one. Please help.
 
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what is the average acceleration?

F=ma
 
I don't know. How would you go about solving for it?
 
Average acceleration is \Delta v / \Delta t
 

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