Solving for Distance of Closest Approach for Moving Protons

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To solve for the distance of closest approach for two protons moving toward each other at speeds of 3.00*10^6 m/s, one must consider their kinetic energy and the potential energy at the moment they come to rest. At closest approach, both protons momentarily stop, meaning their kinetic energy is converted into potential energy. The potential energy between the protons can be calculated using the formula for electric potential energy due to their charge. Understanding these energy transformations is crucial for determining the distance of closest approach.
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Homework Statement


Two protons are moving directly toward one another. When they are very far apart, their initial speeds are 3.00*10^6 m/s. What is the distance of closest approach?


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The Attempt at a Solution


I really need help in question. I need to know how to start this question. Please help! Thank you!
 
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They both have kinetic energy.

If they have identical speeds, then they will both momentarily come to rest at their closest approach.

If they are at rest relative to each other then what is their potential energy with respect to each other at that moment?
 

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