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General
Easy

Question

A particle moves along a parabolic path y = 9x2 in such a way that the x component of velocity remain constant and has a value fraction numerator 1 over denominator 3 end fraction text m end text text s end text to the power of negative 1 end exponent. The acceleration of the particle is

  1. fraction numerator 1 over denominator 3 end fraction stack j with logical and on top text m end text text s end text to the power of negative 1 end exponent    
  2. 3 stack j with logical and on top text m end text text s end text to the power of negative 2 end exponent    
  3. fraction numerator 2 over denominator 3 end fraction stack j with logical and on top text m end text text s end text to the power of negative 2 end exponent    
  4. 2 stack j with logical and on top text m end text text s end text to the power of negative 2 end exponent    

The correct answer is: 2 stack j with logical and on top text m end text text s end text to the power of negative 2 end exponent


    y equals 9 x to the power of 2 end exponent
    fraction numerator d y over denominator d x end fraction equals V subscript y end subscript equals 18 x V subscript x end subscript
    A subscript y end subscript equals 18 V subscript X end subscript superscript 2 end superscript a n d A subscript x end subscript equals 0
    A subscript y end subscript equals 18 x fraction numerator 1 over denominator 9 end fraction equals 2 m divided by s to the power of 2 end exponent

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