Usain Bolt ran 100 meters in 9.63 seconds in the 2012 Olympics.

Which is his speed as a unit rate? Round to the nearest tenth.
9.6 meters per second
10.4 meters per second
963.0 meters per second
103.8 meters per second

1 answer

To find Usain Bolt's speed as a unit rate, we can use the formula for speed, which is:

\[ \text{Speed} = \frac{\text{Distance}}{\text{Time}} \]

In this case, the distance is 100 meters and the time is 9.63 seconds.

Now we can calculate his speed:

\[ \text{Speed} = \frac{100 \text{ meters}}{9.63 \text{ seconds}} \approx 10.4 \text{ meters per second} \]

Rounding to the nearest tenth, Usain Bolt's speed during the 2012 Olympics was 10.4 meters per second. Therefore, the correct answer is:

10.4 meters per second.