1. The problem statement, all variables and given/known data A child’s toy that is made to shoot ping pong balls consists of a tube, a spring (k = 18 N/m) and a catch for the spring that can be released to shoot the balls. When a ball is loaded into the tube, it compresses the spring 9.5 cm. If you shoot a ping pong ball straight up out of this toy, how high will it go? 2. Relevant equations I know how to solve this... one thing gets in my way: the mass. The solution says it's .0027 but I hardly find that plausible. 3. The attempt at a solution I used f=kx and f = mg so mg=kx and m(9.81) = (18*.095m) My answer is like .17 not .0027.. any ideas?