science
Grade-9
Easy

Question

The s-t graph of a car is shown in the figure below. Choose the option that shows the right ascending order of the magnitudes of velocities that the car had throughout its motion.

  1. AB > CD > EF
  2. AB > EF > CD
  3. CD > EF > AB
  4. CD > AB > EF

hintHint:

CD > EF > AB

The correct answer is: CD > EF > AB


    Solution:
    V e l o c i t y space A B space equals space 3 over 5 space equals space 0.6 m s to the power of negative 1 end exponent
V e l o c i t y space B C space equals space fraction numerator 3 minus 3 over denominator 8 minus 5 end fraction equals space 0 m s to the power of negative 1 end exponent
V e l o c i t y space C D space equals space fraction numerator 12 minus 3 over denominator 12 space minus 8 space end fraction space equals space 9 over 4 equals 2.25 m s to the power of negative 1 end exponent
V e l o c i t y space D E space equals space fraction numerator 12 space minus space 12 over denominator 14 minus 12 end fraction equals space 0 m s to the power of negative 1 end exponent
V e l o c i t y space E F space equals space fraction numerator 12 space minus space 0 space over denominator 20 minus 14 end fraction space equals space fraction numerator 12 over denominator 6 space end fraction equals 2 m s to the power of negative 1 end exponent
    Answer:
    Ascending order: AB < EF < CD

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