- #1
holezch
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forces again.. *sigh* please help me , this is not homework!
1. Homework Statement
a man of mass 80 kg ( weight 176 lb), jumps down to a concrete patio from a window ledge only 0.50 m above ground. He neglects to bend his knees on landing, so that his motion is arrested in a distance of about 2.0 cm.
a) what is the average acceleration of the man from the time his feet first touch the patio to the time he is brought fully to rest?
b) with what average force does this jump jar his bone structure?
2. Homework Equations
f = ma, 3rd law
3. The Attempt at a Solution
I really don't know what to do at all...
if a man falls down and accelerates a little bit forward after the fall, will the same force from falling transfer to that small time he is moving forward?
and how will an acceleration be affected if something is falling from the sky and then bounces off the ground? touching the ground will make it go slower wouldn't it
please help me, this is not homework.. I'm trying to learn physics out of some book and it feels impossible
1. Homework Statement
a man of mass 80 kg ( weight 176 lb), jumps down to a concrete patio from a window ledge only 0.50 m above ground. He neglects to bend his knees on landing, so that his motion is arrested in a distance of about 2.0 cm.
a) what is the average acceleration of the man from the time his feet first touch the patio to the time he is brought fully to rest?
b) with what average force does this jump jar his bone structure?
2. Homework Equations
f = ma, 3rd law
3. The Attempt at a Solution
I really don't know what to do at all...
if a man falls down and accelerates a little bit forward after the fall, will the same force from falling transfer to that small time he is moving forward?
and how will an acceleration be affected if something is falling from the sky and then bounces off the ground? touching the ground will make it go slower wouldn't it
please help me, this is not homework.. I'm trying to learn physics out of some book and it feels impossible
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