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7. MOTION
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What do you understand by the displacement$-$time graph ? Draw a displacement-time graph for a girl going to school with uniform velocity. How can we calculate the uniform velocity from it ?
Option A
Option B
Option C
Option D
Solution

In the displacement-time graph, the time is taken on the $x -$axis and the displacement of the body is taken on the $y -$axis. Since
Velocity $=$ Displacement $/$ Time,
therefore, the slope of the displacement-time graph gives the velocity. For example, a girl is going to school on a straight path in a given direction with a uniform speed. The velocity of the girl can be obtained by finding the slope of the straight line $OP.$
The velocity of the girl can be calculated as below
$v=\frac{ BC }{ AC }=\frac{ ED }{ GF }=\frac{(40-20)}{(4-2)}=10 m s ^{-1}$
Standard 9
Science
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