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General
Easy

Question

A small mass m slides from a point A of smooth quarter circular surface of mass M (free to move) as shown in figure. Mass M lies on smooth ground. When m reaches point B of M : (AB is one-fourth part of a circle of radius ‘r’) [Line OA is horizontal and OB is vertical]

  1. velocity of m w.r.t. M is square root of 2 g r end root    
  2. velocity of M w.r.t. ground is fraction numerator m square root of 2 g r end root over denominator M plus m end fraction    
  3. work done by normal reaction on m is zero    
  4. none of these    

The correct answer is: none of these

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