Answer:
(b) 0.29 m/s
Explanation:
The average speed is found by dividing the net displacement by the amount of time it took to achieve that displacement.
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The net displacement is ...
6 m -8 m = -2 m . . . . . where north is positive
The total time is ...
2 s + 5 s = 7 s
Then the distance per unit time (speed) is ...
(2 m)/(7 s) = 2/7 m/s ≈ 0.29 m/s
