   Chapter 5, Problem 67AP

Chapter
Section
Textbook Problem

(a) A 75-kg man steps out a window and falls (from rest) 1.0 m to a sidewalk. What is his speed just before his feet strike the pavement? (b) If the man falls with his knees and ankles locked, the only cushion for his fall is an approximately 0.50-cm give in the pads of his feet. Calculate the average force exerted on him by the ground during this 0.50 cm of travel. This average force is sufficient to cause damage to cartilage in the joints or to break bones.

(a)

To determine
The speed of the man just before his feet strikes the pavement.

Explanation

Given Info:

Mass of the man is 75.0kg .

The height from which he fell down is 1.0m .

Formula to calculate the speed of the man is,

v=v02+2ay(Δy)

• ay is the acceleration of the man when he falls down
• Δy is the change in height from where which man falls
• v0 is the initial velocity of the man

Substitute 9.8m/s2 for g , zero for v0 and 1

(b)

To determine
The average force excreted on the man by the ground.

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