Question

The speed of a car is 16 meters per second. What is this speed in miles per hour? What is

а
this speed in miles per hour? (1.61 km = 1 mile, 60 seconds = 1 minute, 60 minutes = 1 hour)
Select one:
a. 180 miles per hour
b. 58 miles per hour
O c. 7.2 miles per hour
d. 36 miles/hour
e. 360 miles per hour

Answer 1

Conversion Factors:

1.61 km = 1 mile

60 sec = 1 min

60 min = 1 hour

Use dimensional analysis to solve.

`=(16\ meters)/(1\ second)` ×
`(1\ km)/(1000\ meters)` ×
`(1 mile)/(1.61\ km)` ×
`(60\ seconds)/(1\ min)` ×
`(60\ min)/(1\ hour)`

`=35.77639752`

= 36 miles/hour

If done properly, you should be left with the units miles/hour