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The figure gives the speed-time graph of the motion of a car. What is the ratio of the distance travelled by car during the last two seconds to total distance travelled in seven seconds

$a)\;\frac{1}{9} \\ b)\;\frac{2}{9} \\c)\;\frac{1}{3} \\ d)\;\frac{4}{9}$

1 Answer

Distance travelled in last two second
$=\large\frac{1}{2} $$\times 2 \times 20$
$=20 m$
Distance travelled in seven seconds
$=\large\frac{1}{2} $$(2+7)\times 20$
$=90 m$
Hence b is the correct answer


answered Jun 27, 2013 by meena.p
edited Jan 25, 2014 by meena.p

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