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**1. Homework Statement**

A proton with mass 1.59*10-27 kg is propelled at an initial speed of 3.49*105 m/s directly toward a uranium nucleus 4.97 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 = 2.18 *10-26 Nm2. Assume that the uranium nucleus remains at rest. What is the speed of the proton when it is 8.60 *10-10 m from the nucleus?

**2. Homework Equations**

net force(F)=rate of change of momentum(dP/dt)

Total Energy before=Total Energy after

mathematically, E=kinetic energy(KE) before+potential energy(U) before=KE after + U after

**3. The Attempt at a Solution**

plugging in given values into the equations i think are relevant, but none of them get you any where..IS THERE AN EQUATION IM SUPPOSED TO USE?