Question

Tyson Gay's best time to run 100.0 meters was 9.69 seconds. What was his average speed during this run, in miles per hour? (3.281ft=1 m)(1 mile=5280 ft)

• Report your answer to three significant figures (round your answer to one decimal place).

Answer 1

Average speed = 23.1 miles/hour

Explanation

Distance covered = 100.0 m

Distance covered = 100.0 m * (3.281 ft / 1 m) * (1 mile / 5280 ft)

Distance covered = 0.06214 miles

Time = 9.69 s

Time = 9.69 s * (1 hour / 3600 s)

Time = 2.69 x 10^-3 hour

Average speed = (Distance covered) / (time)

Average speed = (0.06214 miles) / (2.69 x 10^-3 hour)

Average speed = 23.1 miles/hour