To set up and solve the equations of motion using rectangular coordinates. The 3-kg collar shown has a coefficient of kinetic friction μk=0.205 with the shaft. The spring is unscratched when s=0 and the collar is given an initial velocity of v0=15.1 m/s. The unscratched length of the spring is d=1.3 m and the spring constant is k=26.2 N/m. What is the acceleration of the collar after it has moved 4.5 m? What is the speed of the collar after it has moved 4.5 m?