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Question
From the displacement – time graph shown given below calculate :
- Velocity between 0 – 2 s.
- Velocity between 8 s – 12 s.
- Average velocity between 5 s – 12 s.
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Solution
1. Velocity between 0 – 2 s = `(-(25-10))/2` .......[negative sign because slope is negative]
= `-15/2`
= −7.5 ms−1
2. Velocity between 8 s – 12 s = `(25-20)/(12-8)=5/4`
= 1.25 ms−1
3. Average velocity between 5 s – 12 s
= `"Total displacement from 5 s to 12 s"/"Time"`
= `(25-10)/(12-5)`
= `15/7`
= 2.1 ms−1
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