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Question

A stone dropped from of the tower touches the ground in 4 blank s e c. The height of the tower is aboout

  1. 80 blank m  
  2. 40 blank m  
  3. 20 blank m  
  4. 160 blank m  

The correct answer is: 80 blank m


    h equals fraction numerator 1 over denominator 2 end fraction g t to the power of 2 end exponent equals fraction numerator 1 over denominator 2 end fraction cross times 10 cross times open parentheses 4 close parentheses to the power of 2 end exponent equals 80 blank m

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