1. The problem statement, all variables and given/known data The left side of the figure shows a light (`massless') spring of length 0.340 m in its relaxed position. It is compressed to 67.0 percent of its relaxed length, and a mass M= 0.250 kg is placed on top and released from rest (shown on the right). The mass then travels vertically and it takes 1.50 s for the mass to reach the top of its trajectory. Calculate the spring constant, in N/m. (Use g=9.81 m/s2). Assume that the time required for the spring to reach its full extension is negligible. 2. Relevant equations EK=1/2mv2=1/2 * 0.25 * V2 K=-0.5mv2/x 3. The attempt at a solution -0.5mv2/x v=14.715 x=11.22 m=0.250 I plugged in the variables, but it still isn't right.