Just need a simple logic check here. Let's say a block of 2kg is positioned on an incline of 53 degrees. 4m from the block is a spring with a k=70N/m. the coefficient of kinetic friction is 0.36. How fast is the block moving when it hits the spring? How far is the spring compressed. Ok, so find the height from the block to the spring (this is <4m), and say Ugrav = Wfriction + KE, to answer the first part. Then, that KE = Uspring + Wfriction to find the compression. Now, Wfriction would be Ff(x), where x is the compression of the spring. Yes? Or, would KE = Uspring be the correct way?