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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.