problem04_46

# University Physics with Modern Physics with Mastering Physics (11th Edition)

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4.46: a) His speed as he touches the ground is s. / m 80 . 7 ) m 10 . 3 )( s / m 80 . 9 ( 2 2 2 = = = gh v b) The acceleration while the knees are bending is . s / m 6 . 50 ) m 60 . 0 ( 2 ) s / m 80 . 7 ( 2 2 2 2 = = = y v a c) The net force that the feet exert on the ground is the force that the ground exerts on the feet (an action-reaction pair). This force is related to the weight and acceleration by , ma mg F w F = - = - so N 4532

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Unformatted text preview: ) s / m 80 . 9 s / m 6 . 50 )( kg . 75 ( ) ( 2 2 = + = + = g a m F . As a fraction of his weight, this force is ( 29 16 . 6 1 = + = g a mg F (keeping an extra figure in the intermediate calculation of a ). Note that this result is the same algebraically as ( 29 1 m 0.60 m 10 . 3 + ....
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problem04_46 - s m 80 9 s m 6 50 kg 75 2 2 = = = g a m F As...

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