Physics-
General
Easy

Question

Two cars A blank a n d blank B are moving with same speed of 45 blank k m h to the power of negative 1 end exponent along same direction. If a third car C coming from the opposite direction with a speed of 36 blank k m h to the power of negative 1 end exponent meets two cars in an interval of 5 min, the distance of separation of two cars A blank a n d blank B should be (in km)

  1. 6.75  
  2. 7.25  
  3. 5.55  
  4. 8.35  

The correct answer is: 6.75


    v subscript r e l end subscript equals 45 plus 36 equals 81 blank k m h to the power of negative 1 end exponent equals 81 cross times fraction numerator 5 over denominator 18 end fraction m s to the power of negative 1 end exponent
    s subscript r e l end subscript equals v subscript r e l end subscript cross times t equals 81 cross times fraction numerator 5 over denominator 18 end fraction cross times open parentheses 5 cross times 60 close parentheses
    equals fraction numerator 81 cross times 5 cross times 5 cross times 60 over denominator 18 end fraction minus 6750 blank m equals 6.75 blank k m

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