During the Tour de France, a bicyclist accelerates downhill at a rate of 1.3 m/s2. If the rider’s initial velocity is 2.6 m/s when he started accelerating down the 1.5-km hill, graphically determine the time required.

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.