Electric Potential Problem. Can someone help quick? Thanks a bunch. I attached a picture of the problem.

Question

anonymous · Answer

try to use the fact that work is variation of kinect  energy

roadjester · Answer

$q_1$ and $q_2$ should cancel each other out so just consider $q_3 $ and $q_4$.
The potential energy is defined as $\huge  k_e{q_3q_4\over r}$.
Equate that to kinetic energy which is $1/2mv^2$.

I haven't done E&M in a while so I'm doing this off the top of my head.

anonymous · Answer

@roadjester it's rigth since in infinity there is no potential energy

roadjester · Answer

@mawaboii ok so according to @RaphaelFilgueiras , that is correct so if the answer ends up wrong, blame him.
=)

jk jk

anonymous · Answer

lol