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The Brainliest Answer!
2014-05-05T18:58:08+05:30
The fastest order is solid sphere, disc, hollow sphere, this is because of the inertia 

solid sphere = 0.7mv^2 = mgh 

disc = 0.75mv^2 = mgh 

hollow sphere = 0.833mv^2 = mgh 


solid sphere velocity = sq-root((gh)/0.7) 

disc velocity = sq-root((gh)/0.75) 

hollow sphere velocity = sq-root((gh)/0.833)
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