A uniform solid cylinder rolls without slipping in the system shown. If the maximum compression in spring is 15 cm , the possible friction force acting on the cylinder during its motion is :-

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Ans. (B) ​ F 1 ​ − f = 3 a f R = 2 3 R 2 ​ R a ​ F 1 ​ = 4.5 a a = 4.5 F 1 ​ ​ f = 4.5 1.5 ​ × 30 = 10 N ​

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