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:

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

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