alleryStart learning →A runner takes 80 s for one lap of a 400 m circular track. What is her average speed?
A5 m/s
B320 m/s
C0 m/s
D0.2 m/s
Answer & Solution
Correct answer: A. 5 m/s
Average speed uses the whole distance, so 400 m divided by 80 s is 5 m/s.
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