1. The problem statement, all variables and given/known data A 4.0 kg block slides along a frictionless horizontal surface at 5.0 m/s. It runs into and compresses a spring with a spring constant of 200 N/m. How far does it compress the spring before it stops and changes direction? 2. Relevant equations P.E. = 0.5 kx^2 K.E. = 0.5 mv^2 3. The attempt at a solution x = sqrt (mv^2/k) = 0.707 m?