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Question

A freely falling stone crashes through a horizontal glass plate at time t and losses half of its velocity. After time fraction numerator t over denominator 2 end fraction it fills on the ground. The glass plate is 60 m high from the ground Find the total distance traveled by the stone. open square brackets g equals 10 text end text m s to the power of negative 2 end exponent close square brackets

  1. 120 m    
  2. 80 m    
  3. 100 m    
  4. 140 m    

The correct answer is: 140 m

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