Physics-
General
Easy

Question

A car moving with speed of 40 blank k m divided by h can be stopped by applying brakes after atleast 2 blank m. If the same car is moving with a speed of 80 blank k m divided by h, what is the minimum stopping distance

  1. 8 blank m  
  2. 2 blank m  
  3. 4 blank m  
  4. 6 blank m  

The correct answer is: 8 blank m


    S proportional to u to the power of 2 end exponent blank therefore fraction numerator S subscript 1 end subscript over denominator S subscript 2 end subscript end fraction equals open parentheses fraction numerator u subscript 1 end subscript over denominator u subscript 2 end subscript end fraction close parentheses to the power of 2 end exponent rightwards double arrow fraction numerator 2 over denominator S subscript 2 end subscript end fraction equals fraction numerator 1 over denominator 4 end fraction rightwards double arrow S subscript 2 end subscript equals 8 blank m

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