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A uniform solid cylinder of mass 'm' and radius 'r' rolls along an inclined rough plane of inclination 45°. If it starts to roll from rest from the top of the plane then the linear acceleration of the cylinder axis will be : -

1. 2 1 g
2. 2 3 1 g
3. 3 g 2
4. g 2

Correct answer: 3 g 2

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