Two point charges q1 and q2 are held 4.00cm apart. An electron released at a point that is equidistant from both charges undergoes an initial acceleration of 9.00×10^18m/s^2 directly upward in the figure, parallel to the line connecting q1 and q2. See the figure: session#masteringphysics#com/problemAsset/1263896/3/1027622#jpg
(replace # with . for link)
Find the magnitude and sign of q1 and q2.
How would I approach this problem?