I am trying to understand what I have done wrong in a problem
The problem was this
starting at rest, a runner reaches a velocity of 0.15 miles per minute after 3 seconds
The way the book did it was to convert the seconds to minutes:
$a = 0.15 - 0 /(3/60)$
$a = 0.15/0.05$
$a = 3$
The way I did it was to convert the miles per minute to miles per second:
$a = (0.15/60)/3$
$a = 0.0025/3$
$a = 0.0008333333$
Multiplying it by 60 to change it into minutes leaves me with
$a = 0.05$
So clearly I have done something wrong.
I thought as long as all items were in the same units, even though they changed the time and I changed the velocity, the answer should come out the same. I feel as though I have done something really simple wrong. I just can't figure out what it is.