No, it goes by a percentage error, as long as your answer is within 2% of the answer given (and they go by 3 SF standard, regardless of what the true SF is) you'll get it right.
What is the potential energy of the "Blue" charge in its initial position?
Using the formula (Q1q)/(4∏ε0r1) + (Q2q)/(4∏ε0r2) + (1/2)mv2
(since there is no kinetic energy in the initial position) I can ignore the "(1/2)mv2"
Using -8.051*10-6C as "q"; 0.03641C as Q1; 0.07973C as Q2...
This is a picture of the question. It's an online assignment.
http://i298.photobucket.com/albums/mm258/wolfboy2712/Capture-1_zps7d609984.png
And THIS is a scan of my work on the question...
Homework Statement
A charge 36.41 mC is placed to the left of another charge 79.73 mC on a plane, as shown in the figure. Another charge of -8.051 μC and mass 14.31 g (depicted as a blue sphere) is placed at rest at a distance 16.34 cm above the right-most charge and released. What is the...