Question

usain bolt, a Jamaica retired sprinter and world record holder in the 100 meters, 200 meters and 4 × 100 meters relay, has an average speed of 23.35 mph. if he runs at this speed in an 80-meter race, in the course of 5 seconds, how many meters he has completed of the race?

Answer 1

For this case we have the following conversion of units:

`1mi = 1609m`

`1h = 3600s`

Thus, applying the conversion of units we have:

`(23.35 (mi)/(h)) ((1609)/(1)(m)/(mi)) (\frac {1}{3600}(h)/(s)) = 10.4 (m)/(s)`

Then, the distance traveled for 5 seconds is given by:

`d = (10.4) (5)`

`d = 52m`

Answer:

he has completed 52 meters of the 80-meter race