Coin Rolling Up Incline, no mass given!? 1. [SFHS99 8.P.46.] A coin with a diameter of 3.40 cm rolls up a 27.0° inclined plane. The coin starts with an initial angular speed of 55.0 rad/s and rolls in a straight line without slipping. How far does it roll up the inclined plane? Having some troubles with this problem, since it doesnt give the mass of the object. I have no problems doing this type of problem when a mass is given, I just use the formula a = (mg sin0)/(m+(I/R^2)), then convert that to angular acceleration, and use angular kinematic equations to find the delta theta, and convert that into a meter value by multiplying the radius by the angular displacement. That doesn't work here though, since I have no mass! Any help would be greatly appreciated, thanks!