Posted by **monica** on Wednesday, February 2, 2011 at 11:56pm.

A student is about to do a push-up. Her

center of gravity lies directly above P on the

ﬂoor, which is 1.1 m from her feet and 0.4 m

from her hands.

If her mass is 55 kg, what is the force exerted by the ﬂoor on her hands? The acceleration of gravity is 9.81 m/s

2

.

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