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Q.

A string is wrapped over the edge of a uniform disc and free end is fixed with the ceiling. The disc moves down, unwinding the string. Then find out the downward acceleration of the disc.

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a

g/3

b

g/2

c

g

d

2g/3

answer is D.

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Detailed Solution

$m g - T = m a T R = \frac{m R^{2}}{2} α$

Solving, we get a= $\frac{2}{3} g$

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