Question

A sprinter is running 200.0 m in 21.9s. What is the average speed of the sprinter in km per hour?

Answer 1

Average speed = 333.3 km/hr

Step-by-step explanation:

The average speed of a body can be found by using the formula

`Average \: \: speed = (distance)/(time)`

To find the average speed in km/h first convert the distance from m to km and the seconds from s to hr.

For the distance

2000 m

1000 m = 1 km

2000 m = 2000/1000 = 2 km

For the seconds

21.9 s

3600 s = 1 hr

21.9 s = 21.9/3600 = 0.006 hrs

Substitute the values into the above formula and solve for the Average speed

That's

`Average \: \: speed = (2)/(0.006)`

We have the final answer as

Average speed = 333.3 km/hr

Hope this helps you