Hello I'm very confused on what the difference is between electric potential and Potential Energy. I though they were the same but I realized they're not after I got a 30% on a physics quiz. I tried googling it but it keeps telling me that potential energy is equal to mgh which is from...
Homework Statement
two Jupiter-size planets are released from rest 1.50×1011m apart.
What is their speed before crash
Homework Equations
GMm/r=U
KE=-GMm/2r
The Attempt at a Solution
I tried setting U+KE=Uf+.5mv^2 and solve for V but it doesn't work :(