Physics-
General
Easy

Question

A weightless rod of length 2 l carries two equal masses 'm', one tied at lower end A and the other at the middle of the rod at B. The rod can rotate in vertical plane about a fixed horizontal axis passing through C. The rod is released from rest in horizontal position. The speed of the mass B at the instant rod, become vertical is :

  1. square root of fraction numerator 3 g l over denominator 5 end fraction end root    
  2. square root of fraction numerator 4 g l over denominator 5 end fraction end root    
  3. square root of fraction numerator 6 g l over denominator 5 end fraction end root    
  4. square root of fraction numerator 7 g l over denominator 5 end fraction end root    

The correct answer is: square root of fraction numerator 6 g l over denominator 5 end fraction end root

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