1. The problem statement, all variables and given/known data An object of mass m=2.2 kg is travelling on a horizontal surface. The coefficient of kinetic friction between the object and the surface is µk=0.2. The object has speed v=0.57 m/s when it reaches x=0 and encounters a spring. The object compresses the spring a distance d/2, stops instantaneously, and then travels back to x=0 where it stops completely. What is the total distance, d, that the object moves after first touching the spring? 2. Relevant equations KE+Espring = KEi+Wfriction Espring=.5k(x^2) Fspring=kx 3. The attempt at a solution I am really confused I don't think I have enough knowns to solve the problem.