A rock is thrown from the top of the Empire State Building. What is the overall acceleration it will experience?

acceleration due to gravity is constant anywhere on the earth .its value is 9.8m/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.)

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue