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  • Question
  • A disk and a sphere of same radius but different masses roll on two inclined planes of the same altitude and length. Which one of the two objects gets to the bottom of the plane first ?


  • Options
  • A. Depends on their masses
  • B. Sphere
  • C. Disk
  • D. Both reach at the same time

  • Correct Answer
  • Sphere 

    Explanation

    Time does not depend on mass, else

    T   ?   1   +   k 2 R 2  

     

      k 2 R 2 => is least for 'sphere' and

     

    hence least time is taken by sphere.

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