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

center of gravity lies directly above P on the floor, which is 1.2 m from her feet and 0.6 m from her hands.If her mass is 56 kg, what is the force exerted by the floor on her hands? The acceleration of gravity is 9.81 m/s2. Answer in units of N

1 answer

The total moment about the toes is zero.
Therefore,

F*1.8 m - M*g*1.2 m = 0

Solve for F, the force on the hands