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2.Motion in Straight Line
medium
For the displacement-time graph shown in figure, the ratio of the magnitudes of the (constant) speeds during the first two seconds and the next four seconds is
A
$1 : 1$
B
$1 : 2$
C
$2 : 1$
D
$3 : 2$
Solution
Slope of displacement$-$time graph $=$ velocity
$\Rightarrow \frac{\mathrm{v}_{1}}{\mathrm{v}_{2}}=\frac{\tan \theta_{1}}{\tan \theta_{2}}=\frac{20 / 2}{20 / 4}=2: 1$
Standard 11
Physics
