Question

In 20092009, Usain Bolt set the world record for sprinting 100 \text{ m}100 m in approximately 9\dfrac359 5 3 ? seconds. Find his average speed in meters per second.

Answer 1

Ans125/12

Explanation:

Answer 2

`10(5)/(12)\approx 10.42` meters per second.

Step-by-step explanation:

We have been given that in 2009, Usain Bolt set the world record for sprinting 100 m in approximately
`9(3)/(5)` seconds.

To find average speed of Usain Bolt in meters per second we will divide 100 by
`9(3)/(5)`.

Let us concert
`9(3)/(5)` in improper fraction.

`9(3)/(5)=(48)/(5)`

`\text{Average speed of Usain Bolt}=100/(48)/(5)`

Since we know that dividing a number by fraction is same as multiplying the number by reciprocal of the fraction.

`\text{Average speed of Usain Bolt}=100*(5)/(48)`

`\text{Average speed of Usain Bolt}=(500)/(48)`

`\text{Average speed of Usain Bolt}=(125)/(12)=10(5)/(12)`

`\text{Average speed of Usain Bolt}=10(5)/(12)\approx 10.42`

Therefore, the average speed of Usain Bolt is
`10(5)/(12)\approx 10.42` meters per second.