Question

Paul drove for one and a half hours at 65 mph before he realized he had forgotten his wallet. How far was he from home?

Answer 1

This question is asking about the body's displacement, assuming constant velocity. Given,

`nu = (65"mi")/"h" * (1609"m")/"mi" * "h"/(3600"s") approx (29"m")/"s"`

`t = 1.5"h" * (3600"s")/"h" = 5400"s"`

Now, recall,

`nu = (Deltax)/t`

Hence, this man drove,

`=> Deltax = nu*t approx 1.6*10^5"m"`

before remembering about his wallet. He better pray he doesn't get pulled over on the way home!