Physics-
General
Easy

Question

A string AB of length 21 is fixed at A to a point on a smooth horizontal table. A particle of mass m attached to B is initially at a distance 1 from A as shown in figure. The particle is projected horizontally with speed u at right angels to AB. The impulsive tension in the string is

  1. mu    
  2. fraction numerator 1 over denominator 2 end fraction m u    
  3. fraction numerator square root of 3 over denominator 2 end fraction m u    
  4. square root of fraction numerator 3 over denominator 2 end fraction end root m u    

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

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