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](https://secure.tutorsglobe.com/CMSImages/1067_A%20sprinter%20of%20mass%20has%20one%20foot%20on%20the%20ground.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.