A 2.0 kg block is falling at a speed of 11 m/s and is 18 meters above the spring. The spring constant is 4000 N/m, to the nearest hundredth of a meter what height will the block rise after it hits and leaves the spring? Help please! I can find the kinetic energy of the falling block by using... K=.5mv^2 ..... I don't know how to go from there! Help!