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Ph 111
NAME __________________________________
September 10, 2008
Quiz 1 Solutions
You start out on a trip by driving in a straight line at a constant speed of 20 m/s for 15 seconds.
You are driving
along the
x
axis, in the positive direction.
Please give all numerical answers to three significant figures, and
include units (
m
or
m/s
) as part of your answer.
(a
)
What is
your average velocity for this part of the trip?
If the speed is constant, it is equal to the average velocity,
noting that the sign is positive, since we are going in the
positive direction.
v
av
= 20 m/s
(b)
What is your displacement during this part of the trip?
Δ
x = 300 m
The displacement is positive, with distance = velocity times
time = (20 m/s)(15 s) = 300 m
Next you start to speed up, accelerating at a constant rate of 2 m/s
2
for the next 15 seconds.
(c)
What is your final velocity?
Using equation (1) below,
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This note was uploaded on 05/13/2010 for the course PHYSICS 111 taught by Professor Staff during the Fall '08 term at S.F. State.
 Fall '08
 Staff

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