1. The problem statement, all variables and given/known data You are designing a delivery ramp for crates containing exercise equipment. The crates weighing 1470 N will move at a speed of 1.80 m/s at the top of a ramp that slopes downward at an angle 25.0. The ramp exerts a kinetic friction force of 540 N on each crate, and the maximum static friction force also has this value. Each crate will compress a spring at the bottom of the ramp and will come to rest after traveling a total distance of 7.70 m along the ramp. Once stopped, a crate must not rebound back up the ramp. 2. Relevant equations K1 + Ugrav1 + Uelastic1 - Wfriction = K2 + Ugrav2 + Uelastic2 3. The attempt at a solution K1 = 0.5*150*1.8^2 Ugrav1 = 0 Uelastic1 = 0 Wfriction = (540)(7.7) = 4158 K2 = 0 Ugrav2 = 1470*(-7.7)(sin25) = -4783 Uelastic2 = 0.5k(7.7^2) Using the above equation, I got k = 29.27. Unfortunately, this is not the correct answer, so I am a little stuck as to what I need to do next.