(Figure 1) shows the potential energy of a proton (q=+e) and a lead nucleus (q=+82e). The horizontal scale is in units of femtometers, where 1fm=1015m 1 of 1 A proton is fired toward a lead nucleus from very far away. How much initial kinetic energy does the proton need to reach a turning point 10fm from the nucleus? Express your answer with the appropriate units. How much kinetic energy does the proton of part A have when it is 20fm from the nucleus and moving toward it, before the collision? Express your answer with the appropriate units