Two protons are released from rest when they are 0.750 nm apart.
What is the maximum speed they will reach?

I already know the answer but I don't understand how to derive the correct formula to use to get that answer please help guys

Question

Two protons are released from rest when they are 0.750 nm apart. 
What is the maximum speed they will reach?

I already know the answer but I don't understand how to derive the correct formula to use to get that answer please help guys

irishboy123 · Answer

$$k\frac{q.q}{r_o} = 2(\frac{1}{2}m \dot r_{\infty}^2)$$??

anonymous · Answer

how do you get that? @IrishBoy123

irishboy123 · Answer

potential energy of the system is $\large U = k\frac{q.q}{r} $ when the protons are distance r apart, yes?