A proton with mass 1.79*10-27 kg is propelled at an initial speed of 2.25*105 m/s directly toward a uranium nucleus 4.39 m away. The proton is repelled by the uranium nucleus with a force of magnitude F = a/x2 where x is the separation between the two objects and a = 2.69 *10-26 Nm2. Assume that the uranium nucleus remains at rest. What is the speed of the proton when it is 7.83 *10-10 m from the nucleus?