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A particle moves along a line by s equals t to the power of 3 end exponent minus 9 t to the power of 2 end exponent plus 24 t then S is decreasing when t element of

  1. (2, 4)    
  2. left parenthesis negative infinity comma 2 right parenthesis union left parenthesis 4 comma infinity right parenthesis    
  3. left parenthesis negative infinity comma 2 right parenthesis    
  4. left parenthesis 4 comma infinity right parenthesis    

The correct answer is: (2, 4)


    STEP BY STEP SOLUTION
    A particle moves along a line by s equals t to the power of 3 end exponent minus 9 t to the power of 2 end exponent plus 24 t then S is decreasing when t element of space left parenthesis 2 comma 0 right parenthesis
    text Solve  end text V less than 0

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