1. The problem statement, all variables and given/known data A 700 g block is released from rest at height h0 above a vertical spring with spring constant k = 445 N/m and negligible mass. The block sticks to the spring and momentarily stops after compressing the spring 20.5 cm. (a) How much work is done by the block on the spring? (b) How much work is done by the spring on the block? (c) What is the value of h0? (d) If the block were released from height 2.00h0 above the spring, what would be the 2. Relevant equations 3. The attempt at a solution I got parts a, b, and c right, and have tried a few different things with d and have gotten it wrong. For a and b, I got 9.35 (b was -9.35), and for c, I got 1.158 m. I went back to my equation for the spring, where [tex]mgh = .5kx^2[/tex], and solved for x but keep getting the wrong answer. I used my answer in c as the new height in mgh, is there something wrong with doing that? I ended up getting the equation... [tex]x^2= 2mgh/k[/tex] Obviously I then just took the square root of that.