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Brit412
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Homework Statement
A charge of 2.9*10^-6C is held fixed at the origin. A second charge of 2.9*10^-6 C is released from rest at the position (1.15m, 0.550m). And the mass of the second charge is 2.10 g.
At what distance from the origin does the 2.9*10^-6 charge attain half the speed it will have at infinity?
Homework Equations
KE (final) = Potential Energy (initial) - PE (final)
The Attempt at a Solution
There was a part A to this question where I figured out the speed it had at infinity. For the second part, I tried to just solve for r using the same equation but it doesn't work. Any tips?