. A man throws a stone vertically downward with an initial speed of 12.0 m/s from the roof of a building, 30.0 m
above the ground. (a) How long does it take the stone to
reach the ground? (b) What is the speed of the stone at
impact?

force tends to be low and long diustance masses are high

the answer is c. the lower legs are levers, and the knees are fulcrums. the ankles hold the loads.

no. bullets are macro objects. wave nature is for light waves, extremely tiny particles. if a light particle was the size of your finger, the bullet would be the size of the universe. so basically, that huge difference in size makes the wave nature of matter insignificant.