Physics-
General
Easy

Question

A boy released a ball from the top of a building. It will clear a window 2m high at a distance 10m below the top in nearly

  1. 1 s  
  2. 1.3 s  
  3. 0.6 s  
  4. 0.13 s  

The correct answer is: 0.13 s


    increment t equals square root of fraction numerator 2 cross times 12 over denominator 10 end fraction end root minus square root of fraction numerator 2 cross times 10 over denominator 10 end fraction end root
    equals 1.549sminus1.414s =0.135s

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