What is the mass of an object if a net force of 8.0 n causes it to accelerate at 1.1 m/s2?

a charge 3q is at the origin, and a charge −2q is on the positive x axis at x=a. part a where on the x-axis would you place a third charge so it would experience no net electric force? enter an expression for the exact answer, which will involve a square-root sign. (do not enter an approximate decimal answer.)

double the distance = divide strength by 4