Use the following data to find average velocity for the first 4 s and for the last 6 s.
Time (s) 0
2 4 6 8 10 12 14 16
Displacement (m) 0 2 4 4 4 6 4 2 0

1 m/s and 1 m/s

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1 m/s and -1 m/s

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-1 m/s and 1 m/s

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2 m/s and 1 m/s

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Solution

The correct option is D 1 m/s and -1 m/s
Average velocity = Total displacement / Total time taken

Average velocity for first $4 s$
$= \frac{4 - 0}{4 - 0} = \frac{4}{4} = 1 m s^{- 1}$

Average velocity for last $6 s = \frac{0 - 6}{16 - 10} = - 1 m s^{- 1}$

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Time (s)	0	2	4	6	8	10	12	14	16
Displacement (m)	0	2	4	4	4	6	4	2	0

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