When jumping straight down, you can be seriously injured if you land stiff-legge

Question

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 190-lb man just before contact with the ground has a speed of 23 ft/s. In a staff-legged landing he comes to a halt in 3.8 ms. What is the average net force that acts on him during this time? State the direction of this force. When he bends his knees, he comes to a halt in 0.16 s. What is the average net force now? State the direction of this force. During the landing, the force of the ground on the man points upward, while the force due to gravity points downward. The average net force acting on the man includes both of these forces. Taking into account the directions of the forces, what is the force applied by the ground on the man in part (b)? State the direction of this force.

Explanation / Answer

c)

We know that Fnet is in upward directiopn

let N be the force by ground in upward direction

gravity in downward direction

therefore

Fnet = N-mg

N = Fnet + mg

substitute the value u got from b in the above equation

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