Question

A sprinter ran the 400 meter dash in 44.62 seconds. Convert her speed into miles per hour

Answer 1

v = 20.7 mph

Explanation:

Given that,

Distance, d = 400 m

Time, t = 44.62 s =

We need to find the speed of the sprinter. The speed of an object is defined as total distance covered divided by time taken. It can be given by :

`v=(d)/(t)\\\\=(0.248\ mile)/(0.012\ s)\ (As\ 1\ m=0.000621371\ mile)\\\\=20.7\ mph`

Hence, the speed of the sprinter is equal to 20.7 mph.