See, it’s the moment of inertia — the solid sphere’s mass is packed closer to the axis, so it resists changes in rotation less than the hollow cylinder. Less energy wasted fighting its own spin, more goes into speeding downhill.
From my work designing conveyor rollers, we always opted for solid cores over hollow tubes when we needed quick acceleration, even if the hollow ones seemed lighter.
Oddly enough, my old neem sapling taught me something similar — a thin, hollow stem would sway and struggle in the wind, but once it filled out solid, it stood firm and shot up faster.
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