Question

how do I convert 55 mph to ft/s

Answer 1

i can teach you two ways...the google way (they are magnificent in conversion) or the self-solving way

which do you prefer?

Answer 2

the self-solvingway

Answer 3

okay... \[55 mph \implies \frac{55 \; \text{miles}}{1 \; \text{hour}}\]
agree?

Answer 4

that's what mph means right?

Answer 5

yes

Answer 6

so now... do you agree that in 1 hour there are 3,600 seconds?

Answer 7

yes

Answer 8

so now i write.. \[\frac{55 \; \text{miles}}{1 \; \text{hour}} \times \frac{1 \; \text{hour}}{3,600 \; \text{seconds}}\]
still following?

Answer 9

yes

Answer 10

now... in 1 mile, there are 5,280 feet so... \[\frac{55 \; \text{miles}}{1 \; \text{hour}} \times \frac{1 \; \text{hour}}{3.600 \; \text{seconds}} \times \frac{5,280 \; \text{feet}}{1 \; \text{mile}}\]
do you still get it?

Answer 11

yes

Answer 12

so now, we cancel the units


\[\frac{55 \; \cancel{\text{miles}}}{1 \; \cancel{\text{hour}}} \times \frac{1 \; \cancel{\text{hour}}}{3.600 \; \text{seconds}} \times \frac{5,280 \; \text{feet}}{1 \; \cancel{\text{mile}}}\]
so now, just simplify that with a calculator and you get your answer

Answer 13

ok

Answer 14

60mph = 88 ft/sec
55/60 of 88 is 80.7 ft/sec rounded to the nearest 1/10