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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. Average velocity in first three seconds.
2. Displacement from initial position at the end of 13 s .
3. Time after which the body is at the initial position,
4. Average velocity after 8 s .
Image
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Answer

(i) In first three seconds
Total displacement $=8 m$
Total time $=3 s$
Average velocity $=$ Total displacement $/$ Totaltime $=8 / 3$
$
=2.67 ms^{-1}
$
(ii) Displacement from initial position at the end of $13 s=-8 m$.
(iii) Body is at the initial position after 8 s and 17 s .
(iv) Average velocity after 8 s is zero because after 8 s , displacement is zero.

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