I have to find the velocity of the cart when it lands right under the spring at 90 degrees. The spring is at an angle. I am not getting the right numbers though, can anyone help? This is my first post here BTW. This community looks awesome! 2. Equations You can use anything, but I used both Conservation of Energy (change in total energy = 0) and Work-Force equation (Work = int(F*ds)) 3. Attempt at a solution You can see my attempt, variables and work here. Thanks in advance. https://imgur.com/a/alJ4Q More variables and work in imgur album.