A 3.00 kg block starts from rest and slides a distance d down a frictionless 30.0° incline. While sliding, it comes into contact with an unstressed spring of negligible mass. The mass slides an additional 0.219 m as it is brought momentarily to rest by compression of the spring (k = 400 N/m). Find the initial separation d between mass and spring.
Kinetic energy: mv^2/2-mu^2/2
Potential energy of a spring: kx^2/2
The Attempt at a Solution
The answer is wrong, haha. But that is what I did, help me?