I can't get this problem and wanted to see if anyone could help me out: A toy truck has a velocity of 6.0 m/s when it begins to role freely up a ramp inclined at 30.0 degrees. They toy has a mass of 5.0 kg, and the frictional forces present are 4.0N. What distance does the truck travel before stopping? I keep on getting 3.5m but the correct answer is 3.2m. Anyone know how to solve this?