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Question
The following table gives the displacement of a car at different instants of time.
| Time (s) | 0 | 1 | 2 | 3 | 4 |
| Displacement (m) | 0 | 5 | 10 | 15 | 20 |
- Draw the displacement-time sketch and find the average velocity of the car.
- What will be the displacement of the car at (i) 2.5 s and (ii) 4.5 s?
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Solution
a.
Displacement-time graph
From the part AB of the graph,
Average velocity = `("Displacement at B - Displacement at A")/"Time taken"`
= `((30 - 20) m)/((6 - 4) s)`
= `(10/2)` m/s
= 5 m/s
(b)
- From the graph, the displacement of car at 2.5 s is 12.5 m.
- From the graph, the displacement of car at 4.5 s is 22.5 m.
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