A solid uniform 3.33 kg disk has string of negligible mass wrapped around its ri

Question

A solid uniform 3.33 kg disk has string of negligible mass wrapped around its rim, with one end of the string tied to the ceiling, as shown in Figure 9.7. The disk is released from rest and turns as it falls as the string unwraps. At the instant its center has fallen 2.25 m, (a) how fast is it moving, and (b) how much rotational kinetic energy does it have? The radius was not given. I know a is v =gh/t = 3.68 m/s or at least I think. Can some help me solve part b. I have KE = 1/2 (IW^2) I know W= v/r , but r is not given. I found this equation :mr2/2 , but I do not know if that means (mr^2)/(2) , but still do not know r.

Explanation / Answer

u did n't post figure re post it

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