1. A spring clamped to a table shoots a 20 g ball horizontally. When the spring is compressed 18 cm the ball travels horizontally 5.1 m and lands on the floor 1.7 m below the point at which it left the spring. What is the spring constant (in N/m) 2. I tried using k=mg/x (x being distance of the spring compression) but am at a COMPLETE loss as how to solve it!