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Assignment Due: Thursday 21 May 17, 2009
3.1) You drive an old car on a level highway at 45 miles/h for 10 miles, then the car stalls.
You leave the car and continue walking to your friend’s house–which is 2 miles away–and
arrive after walking 20 minutes. What is your average velocity during the whole trip?
Solution:
3.2) You start your car in Fayetteville and drive due East at 60mph, stopping after you
have driven for 3 hours (yes, in Arkansas this is one of those “unattainable idealizations”,
or “models”, that physicists like so much, but let’s pretend it could happen).
(a)What is your speed during the trip?
(b)Is this a scalar or vector quantity?
(c)How far have you gone? Is this a scalar or a vector?
(d)Write a vector expression for your position after you stop, assuming Fayetteville is the
origin (like “N units of distance in the Q direction”).
(e)Write a similar vector expression for your velocity while you are travelling.
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 Spring '08
 Stewart
 Physics, Work

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