Question

A car travels 6 m north for 2 seconds and 8 m south for 5 seconds. What is the car's

average speed?
2 m/s
O 0.29 m/s
14 m/s
7 m/s

Answer 1

2 m/s. 6+8/2+5 = 14/7 = 2

Answer 2

(b) 0.29 m/s

Step-by-step explanation:

The average speed is found by dividing the net displacement by the amount of time it took to achieve that displacement.

__

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