A thin light string is wrapped around the outer rim of a uniform hollow cylinder of mass 4.30 having inner an?

a) How far must the cylinder fall before its center is moving at 6.12 ?
i got 3.18 m

b) If you just dropped this cylinder without any string, how fast would its center be moving when it had fallen the distance in part A?

here is the pictue C:\Users\JOMOOD\Desktop\yg_9_33.jpg
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