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**1. Homework Statement**

Two protons are moving directly towards each other. When they are very far apart, their initial speeds are 1.5 x 10^6 m/s. What is the distance of closest approach?

**2. Homework Equations**

**3. The Attempt at a Solution**

I know how to do this problem when one of the charges are fixed by using the law of conservation of energy. But in this problem, they are both moving towards each other, so is it possible to still use energy? In what manner?

Thanks everyone for helping out!! =)