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Question

A stone is thrown with an initial speed of 4.9 blank m divided by s from a bridge in vertically upward direction. It falls down in water after 2 blank s e c. The height of the bridge is

  1. 4.9 blank m  
  2. 9.8 blank m  
  3. 19.8 blank m  
  4. 24.7 blank m  

The correct answer is: 9.8 blank m


    Speed of stone in a vertically upward direction is 4.9 blank m divided by s. So for vertical downward motion we will consider u equals negative 4.9 blank m divided by s
    h equals u t plus fraction numerator 1 over denominator 2 end fraction g t to the power of 2 end exponent equals negative 4.9 cross times 2 plus fraction numerator 1 over denominator 2 end fraction cross times 9.8 cross times open parentheses 2 close parentheses to the power of 2 end exponent equals 9.8 blank m

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