1. The problem statement, all variables and given/known data A 0.500-kg block is attached to a horizontal spring that is at its equilibrium length, and whose force constant is 23.0 N/m. The block rests on a frictionless surface. A 5.60×10^-2 kg wad of putty is thrown horizontally at the block, hitting it with a speed of 2.00 m/s and sticking. 2. Relevant equations p=mv KE=0.5 mv^2 PE=0.5 kx^2 vf= (m1V1,i + m2v2,i)/m1+m2 3. The attempt at a solution I tried finding the kinetic energy of the wad of putty as it hit the spring and I got 0.112. I then used this as the PE of the spring and solved for x in the PE equation getting 0.099 m. I know that this is wrong however. I just don't know how to attack this problem.