A cyclist moves 120 m east and then 50 m west in a total time of 20 s. What is the average velocity?
Correct answer D. 3.5 m/s east
Explanation
Net displacement = 120 − 50 = 70 m east. Average velocity = 70/20 = 3.5 m/s east. Dividing the total distance of 170 m by 20 s gives the average speed, 8.5 m/s.
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