1. The problem statement, all variables and given/known data This isn't really coursework or homework, but something I really want to confirm. There is a ramp of height h on an angle θ that a car is placed on that leads to a wall perpendicular to the ground (looks like this: |∠). When calculating velocity of the car when it hits the wall using E = E', do I need to account for θ? Every instinct I have says yes, but I want confirmation. 2. Relevant equations E = E' 3. The attempt at a solution E = E' mgh = 1/2 mv^2 Solve for v .. doesn't really matter what it is. Is the velocity of the car in a momentum equation (p = mv) equal to v or is it equal to v*cosθ?