To what force is the stone subjected during the acceleration ​

The dot diagram represents the motion of the motorcycle as it moves from left to right

Aball horizontally thrown from a cliff at 8m/s

The protons in a nucleus are approximately 2 ✕ 10^−15 m apart. consider the case where the protons are a distance d = 1.93 ✕ 10^−15 m apart. calculate the magnitude of the electric force (in n) between two protons at this distance.