A runner races in the 100 meter dash. It takes her 10 seconds to finish. What is her average speed?
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Answer: Given= Total distance=100 meter
Time taken=10 seconds
Average speed = Total Distance /Total Time taken
so ,average speed= 100/10 m/sec
average speed=10m/sec
Explanation:we know that 1m=1/1000 km
therefore the average speed is 10m/second
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