1. The problem statement, all variables and given/known data In a physics lab experiment, a spring clamped to the table shoots a 22 g ball horizontally. When the spring is compressed 18 cm, the ball travels horizontally 5.2 m and lands on the floor 1.5 m below the point at which it left the spring. 2. Relevant equations Us= .5kx^2 3. The attempt at a solution I tried to find the elastic potential energy and then i got stuck.