1. The problem statement, all variables and given/known data A spring is compressed by 90 cm at the bottom of a frictionless hill of height 18m. the spring is realeased and propels a 2 kg block over the hill. At the top of the hill, the block's speed is 6 m/s. Find the force constant (spring constant) of the spring. 2. Relevant equations 1/2kx^2, 1/2mv^2 and mgy 3. The attempt at a solution mgy=1/2kx^2+1/2mv^2 I solved for K and it did no give me the right answer. what i'm I doing wrong is this the right set up???