The torque is given by formula
where I is the moment of inertia, ε is angular acceleration
In our case, the moment of inertia is equal to
The angular acceleration is given by formula
Cylinder moves only under friction, and we can write according to the Second Law of Newton
Using (4) we get
We put (5) in (3)
We put (2) and (6) in (1)
Using (7) we get: M=24
Answer
24
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