1. The problem statement, all variables and given/known data If the incline plane is 10 m long, and it is elevated at an angle of 30 degrees: If a 5kg object takes t1 seconds to go down the ramp and a 10kg object takes t2 seconds to go down the ramp... What is the relationship between t1 and t2? 2. Relevant equations F = ma Fx of slope = mgsinx Fnorm = mgcosx 3. The attempt at a solution If the incline plane is 10 m long, and it is elevated at an angle of 30 degrees... Then this means the x component of acceleration down the ramp is 4.9 m/s^2 meaning that a 5 kg object and 20 kg object will take the same amount of time to go down this 10 m ramp. This is correct, right? Secondly: Also, if you throw an object up, when Vf = 0 it will start accelerating downwards. Does this mean the velocity increases, or decreases? I answered in class that it depends on relativity, being as its a vector quantity (i.e. up can be negative or down can be negative). The teacher said this is wrong, and the velocity has to increase. Why?