1. The problem statement, all variables and given/known data An object of mass m starts from rest and slides a distance d down a frictionless incline of angle (theata). While sliding, it contacts an unstressed spring of negligible mass as shown in the Figure below. The object slides an additional distance x as it is brought momentarily to rest by compression of the spring (of force constant k). Find the initial separation d between object and spring. (Use theta for (theta), g for acceleration due to gravity, and m, k and x as necessary.) http://www.webassign.net/pse/p8-10.gif 2. Relevant equations Initial energy=finnl energy K.Ei+P.Ei=K.Ef+P.Ef 3. The attempt at a solution Here is how I tried to solve it: Initial energy=0+mgh1 Final energy=0+mgh2+1/2kx² intial energy=Final energy mgh1=mgh2+1/2kx² mgh1-mgh2=1/2kx² mg(h1-h2)=1/2kx² (1) since h1-h2=(d+x)sin(theta) By substituation in equation (1): mg(d+x)sin(theta)=1/2kx² then we can solve for d I found a bit different answer in the answers sheet.