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person is standing on a building with a height h. His mass is m and acceleration due to gravity is g. (a) Draw a fre

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter5: Displacement And Force In Two Dimensions

Section: Chapter Questions

Problem 8STP

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Question

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A person is standing on a building with a height h. His mass is m and acceleration due to gravity is g.
(a) Draw a free body diagram of the person and indicate all the forces on him.
(b) (Find the magnitude of the velocity of the person after he jumps from the
building reaching a height x above the ground.
(c) We all know from our day-to-day life experience that when someone jumps from a height and lands on their feet, the jumper always bends the knee a bit. Compute the force felt by the jumper when he comes to rest on the ground. Also, can you comment on what happens if someone does not bend their knees when jumping from high altitude? Show a mathematical reasoning behind your comment.

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