Please help me! Two protons (mass =1.67 x 10-27 kg, charge =1.6 x 10-19 C) in a nucleus are 10-15 m apart.
If they were free to move and start from rest, find their speeds when they are 8.0 x 10-15 m apart.

Atank has a shape of a cone with a radius at the top of 2 m and a height of 5 m. the tank also has a 1 m spout at the top of the tank. the tank is filled with water up to a height of 2 m. find the work needed to pump all the water out the top of the spout. (use 9.8 m/s2 for g and the fact that the density of water is 1000 kg/m3.)