A sprinter of mass 605 kg has one foot on the ground as, Ask an Expert

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A sprinter of mass 60.5 kg has one foot on the ground, as shown in the figure below. The force F exerted by the ground at point P is directed so that the torque about the body's center of mass is approximately zero. (Let h = 0.845 m.)

1067_A sprinter of mass has one foot on the ground.gif

(a) Find the angle θ this force makes with the horizontal.

(b) Find the instantaneous acceleration of the center of mass, assuming that it is directed horizontally.

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