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DPatel304
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Homework Statement
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.
Homework Equations
K1 + Ugrav1 + Uelastic1 - Wfriction = K2 + Ugrav2 + Uelastic2
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.