Question

Using a stopwatch, Tyrone determines it takes him 58.2 minutes to travel 30 miles to work. The stopwatch measures to hundredths of a minute. Going by the accuracy of the stopwatch, which is the most accurate determination for the number of feet per second Tyrone traveled on his way to work?

Answer 1

Are there choices??

Answer 2

we need to convert 30 miles/58.2 minutes to feet/second

1 mile = 5280 feet
1 minute = 60 seconds

applying dimensional analysis

\[\frac{ 30~miles }{ 52.8~minutes }\frac{ 1~minute }{ 60~seconds }\frac{ 5280~feet }{ 1~mile }\]

*** important *** the question is asking to go by the significance of the stopwatch, so since 58.2 minutes has 3 sig figs, round your dimensional analysis to three digits

Answer 3

The choices are shown below:
19.8 feet per second
19.84 feet per second
45.3 feet per second
45.36 feet per second