A 72.1 man steps off a platform 3.05 above the ground. He keeps hislegs straight as he falls, but at the moment his feet touch theground his knees begin to bend, and, treated as a particle, hemoves an additional 0.640 before coming to rest.
What is his speed at the instant his feet touch the ground?
I have this answer as 7.73 m/s.
Treating him as a particle, what is the magnitude of hisacceleration as he slows down if the acceleration isconstant?
46.7 m/s squared
Treating him as a particle, what is the direction of hisacceleration as he slows down if the acceleration isconstant?
upward
*I am having trouble with the rest of these.
Draw a free-body diagram of this man as he is slowing down.
Use Newton's laws and the results of part B to calculate the forcethe ground exerts on him while he is slowing down. Express thisforce in newtons.
Use Newton's laws and the results of part to calculate the forcethe ground exerts on him while he is slowing down. Express thisforce as a multiple of the man's weight.
What is the magnitude of the reaction force to the force you foundin part E?
What is the direction of the reaction force to the force you foundin part E?
upward or downward
I would really appreciate help with this problem. I don'tunderstand the last parts at all.
Thanks!
A 72.1 man steps off a platform 3.05 above the ground. He keeps hislegs straight as he falls, but at the moment his feet touch theground his knees begin to bend, and, treated as a particle, hemoves an additional 0.640 before coming to rest.
What is his speed at the instant his feet touch the ground?
I have this answer as 7.73 m/s.
Treating him as a particle, what is the magnitude of hisacceleration as he slows down if the acceleration isconstant?
46.7 m/s squared
Treating him as a particle, what is the direction of hisacceleration as he slows down if the acceleration isconstant?
upward
*I am having trouble with the rest of these.
Draw a free-body diagram of this man as he is slowing down.
Use Newton's laws and the results of part B to calculate the forcethe ground exerts on him while he is slowing down. Express thisforce in newtons.
Use Newton's laws and the results of part to calculate the forcethe ground exerts on him while he is slowing down. Express thisforce as a multiple of the man's weight.
What is the magnitude of the reaction force to the force you foundin part E?
What is the direction of the reaction force to the force you foundin part E?
upward or downward
I would really appreciate help with this problem. I don'tunderstand the last parts at all.
Thanks!
