Browse Questions

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

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

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$
$=90 m$
$Ratio=\large\frac{20}{90}$
$\qquad=\large\frac{2}{9}$
Hence b is the correct answer

edited Jan 25, 2014 by meena.p