Question

While traveling south on an expressway, a car traveling 60 mph (miles per hour), slows down to 30 mph in 12 minutes due to traffic conditions. Calculate the acceleration.

Answer 1

\[a = \frac{ vf-vi }{ t }\]

Answer 2

that makes sense for you ?

Answer 3

No whats vf or vi?

Answer 4

vf= final velocity
vi = initial velocity

Answer 5

So its -30mph?

Answer 6

Divided by 1/5 hr?

Answer 7

So its -150mph?

Answer 8

i guess you have to convert

Answer 9

What?

Answer 10

i mean the units to m/s

Answer 11

cause an acceleration has units of\[\frac{ m }{ s ^{2} }\]

Answer 12

Miles o minutes?

Answer 13

do you have the clue i mean in your text book ?

Answer 14

they sometimes give the answer

Answer 15

It says that if the speed were given in miles per hour and the time in minutes, you could change the minites to a fraction of an hpur and do the problem. THe anwer would be in miles/hr.

Answer 16

look what I wolud do

Answer 17

yes, sorry my bad. i'm used to work with meters per second

Answer 18

so the only thing you have to convert is minuts so you were right

Answer 19

lol, ;) now solve for a

Answer 20

Which is -150

Answer 21

:) and the units ?

Answer 22

-150 mi/hr?

Answer 23

ther is something missing, you're two thirds right

Answer 24

check out the time units

Answer 25

Thats what i dont get?

Answer 26

remember an accelation has units of:
\[a =\frac{ longitud }{ time ^{2} }\]