Physics-
General
Easy

Question

A simple pendulum is released from Ashown. If m and l represent the mass of the bob and Length of the pendulum, the gain kinetic energy
at B is

  1. fraction numerator m g l over denominator 2 end fraction    
  2. fraction numerator m g l over denominator square root of 2 end fraction    
  3. fraction numerator square root of 3 over denominator 2 end fraction m g l    
  4. fraction numerator 2 over denominator square root of 3 end fraction m g l    

The correct answer is: fraction numerator square root of 3 over denominator 2 end fraction m g l


    Loss of potential energy in coming from A to B
    equals m g h
    equals m g l cos invisible function application 30 degree equals fraction numerator square root of 3 over denominator 2 end fraction m g l

    Kinetic energy gained = loss of potential energy
    equals blank fraction numerator square root of 3 over denominator 2 end fraction m g l

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