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Motion in One Dimension — PHYSICS STD 9 — Question

ICSE BoardEnglish MediumSTD 9PHYSICSMotion in One Dimension3 Marks
Question
From the displacement - time graph shown given below calculate :
1. Velocity between $0-2 s$.
2. Velocity between $8 s-12 s$.
3. Average velocity between $5 s-12 s$.
Image
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Answer

(i) Velocity between $0-2 s=\frac{-(25-10)}{2}$
[negative sign because slope is negative]
$
=-\frac{15}{2}=-7.5 ms^{-1}
$
(ii) Velocity between $8 s-12 s=\frac{25-20}{12-8}=\frac{5}{4}=1.25 ms^{-1}$
(iii) Average velocity between $5 s-12 s$
$
\begin{array}{l}
=\frac{\text { Total displacement from } 5 s \text { to } 12 s}{\text { Time }} \\
=\frac{25-10}{12-5}=\frac{15}{7}=2.1 ms^{-1}
\end{array}
$

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