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Question

A small ball B of mass m is suspended with light inelastic string of length L from a block A of same mass m which can move on smooth horizontal surface as shown in the figure. The ball is displaced by angle theta from equilibrium position & then released.

The displacement of centre of mass of A + B system till the string becomes vertical is

  1. zero    
  2. fraction numerator L over denominator 2 end fraction left parenthesis 1 minus c o s invisible function application theta right parenthesis    
  3. fraction numerator L over denominator 2 end fraction left parenthesis 1 minus s i n invisible function application theta right parenthesis    
  4. none of these    

The correct answer is: fraction numerator L over denominator 2 end fraction left parenthesis 1 minus c o s invisible function application theta right parenthesis

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