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As David Bowman points
out, analyzing a realistic rolling motion would be messier.
Not really that messy if one rolls on plane surfaces. Because the
actual value of g falls out of the problem, any object which
accelerates down the plane like K*g* sin(theta), where K is some
constant depending on the details, and K*g for the straight down part
will have equal times at tan(theta) = 0.75 or theta = 36.87...
Spheres or disks which roll without slipping have such an
acceleration.