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Question

A balloon is rising vertically up with a velocity of 29 blank m s to the power of negative 1 end exponent. A stone is dropped from it and it reaches the ground in 10 seconds. The height of the balloon when the stone was dropped from it is left parenthesis g equals 9.8 blank m s to the power of negative 2 end exponent right parenthesis

  1. 100 blank m  
  2. 200 blank m  
  3. 400 blank m  
  4. 150 blank m  

The correct answer is: 200 blank m


    For stone to be dropped from rising balloon of velocity 29 blank m divided by s
    u equals negative 29 blank m divided by s comma blank t equals 10 s e c
    therefore h equals negative 29 cross times 10 plus fraction numerator 1 over denominator 2 end fraction cross times 9.8 cross times 100
    equals negative 290 plus 490 equals 200 blank m

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