Physics-
General
Easy

Question

The velocity-time graph of a body is shown in figure. The ratio of the ... during the intervals O A and A B is.

  1. Average velocities:2    
  2. fraction numerator O A over denominator A B end fraction colon fraction numerator 1 over denominator 3 end fraction    
  3. Average accelerations, same as distance covered    
  4. Distance covered : fraction numerator 1 over denominator 2 end fraction    

The correct answer is: fraction numerator O A over denominator A B end fraction colon fraction numerator 1 over denominator 3 end fraction


    (i) fraction numerator fraction numerator 1 over denominator 2 end fraction cross times O A cross times A C over denominator O A end fraction plus fraction numerator fraction numerator 1 over denominator 2 end fraction cross times A B cross times A C over denominator A B end fraction equals 1
    (ii) tan60degree=fraction numerator C A over denominator O A end fraction and tan30degree=fraction numerator C A over denominator A B end fraction
    O A tan60degree=A B blanktan 30 degree
    or fraction numerator O A over denominator A B end fraction equals fraction numerator t a n 30 degree over denominator t a n 60 degree end fraction equals fraction numerator 1 over denominator square root of 3 end fraction cross times fraction numerator 1 over denominator square root of 3 end fraction equals fraction numerator 1 over denominator 3 end fraction

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