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their velocity leaving the ramp should be independent of both mass and radius
nope, it really is independent of radius and masshe's just rolling the marbles off the ramp and then they fall through the air, right?
in which case, the distance is dependent on velocity, and a larger radius should mean a smaller velocity
(but then, you would assume the heavier marble would have the larger radius =/)
in that case it would probably some kind of friction issue? maybe friction for a rolling body along this surface is such that it has less effect on the heavier marble. i dunnoI'm pretty sure he's talking about the distance it rolls once it has landed.
oh wait yeah =/nope, it really is independent of radius and mass