A spherical object has a(n) 54.4 m diameter. Its moment of inertia about a diameter is I = fMR^2, where M is its mass, R is its radius, and f = 0.302. The acceleration of gravity is 9.8 m/s^2 Starting from rest, how long will it take this object to roll, without slipping, 10.88 m down an incline that makes an angle of 35.1 degrees with the horizontal? Answer in units of s. How does I figure this out without a given mass? Does it cancel out in the calculation? An approach to this and concepts involved in solving this would help greatly. I don't know, I don't like moment of interia nor torque. :( I have my final exam tomorrow, help is greatly needed and much appreciated.