Question

A sprinter set a high school record in track and field, running 200.0 m in 21.9 s. What is the average speed of the sprinter in kilometers per hour?

Answer 1

Answer:- The average speed of sprinter is
`32.9(km)/(hour)` .

Solution:- From given data, distance covered by the sprinter is 200.0 m and it takes 21.9 seconds. We know that:

`speed=(distance)/(time)`

Let's plug in the values and calculate the speed.

`speed=(200.0m)/(21.9sec)`

`speed=9.13(m)/(sec)`

It wants speed in kilometer per hour. So, let's do the unit conversion as:

1000 m = 1 km

60 sec = 1 min

60 min = 1 hour

The set up looks as:

`9.13(m)/(sec)((1km)/(1000m))((60sec)/(1min))((60min)/(1hour))`

=
`32.9(km)/(hour)`

So, the average speed of the sprinter is
`32.9(km)/(hour)` .