Physics-
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Easy

Question

A disc of mass m and radius R is placed over a plank of same mass m. There is sufficient friction between disc and plank to prevent slipping. A force F is applied at the centre of the disc. Force of friction between the disc and the plank is :-

  1. F/2    
  2. F/4    
  3. F/3    
  4. 2F/3    

The correct answer is: F/4

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