What's the answer for this question

Along the line connecting the two charges, at what distance from the charge q1 is the total electric field from the two charges zero? express your answer in terms of some or all of the variables s, q1, q2 and k =14ï€ïµ0. if your answer is difficult to enter, consider simplifying it, as it can be made relatively simple with some work.

A2k pendulum has a speed of 1 m/s at a height of 1/2 meter

Scientific models are based on current knowledge, which can limit their effectiveness when new discoveries are made.