1. The problem statement, all variables and given/known data Well i have a tiny question here a 2 kg mass starts at rest and slides down a 10 m high, 15 m long frictionless ramp. At the bottom of the ramp it reaches a flat surface where it hits and sticks to a stationary 3 kg mass . Find the final speed of the masses after collision. 2. Relevant equations mgh = .5mv^2 3. The attempt at a solution i was just wondering does the 15 m really matter, where do i use it. I understand the second momentum part of the question but i dont understand what i am supposed to do with the 15 m. All i did was mgh = .5mv^2 and substituted height and mass to get velocity. Please Help.