As shown in the figure, a bob of mass m is tied to a massless string whose other end portion is wound on a fly wheel (disc) of radius r and mass m. When released from rest the bob starts falling vertically. When it has covered a distance of h, the angular speed of the wheel will be:
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
Using work-energy theorem
Hence, 
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