Physics 125
Discussion #2
1
Problem 1: OneDimensional Motion
A car accelerates uniformly in one dimension from 5 m/s to 30 m/s in 10 s.
(1)
First, define your coordinate system.
(2)
Write out the know factors:
Initial velocity,
_
__________
0
=
v
harpoonrightnosp
Final velocity,
_
__________
=
v
harpoonrightnosp
Time interval,
Δ
t = ____________
(3)
What is the car’s acceleration?
(4)
What is the car’s average velocity for this time interval?
(5)
How far does the car travel during this time?
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Physics 125
Discussion #2
2
Problem 2: Two Bodies with Different Accelerations
A motorist traveling with constant velocity of 15 m/s (about 34 mph) passes a school
crossing corner, where the speed limit is 10 m/s (about 22 mph). Just as the motorist
passes, a police officer on a motorcycle stopped at the corner starts off in pursuit with
constant acceleration of 3.0 m/s
2
.
(1)
First, define our coordinate system. Let’s take the origin at the corner and the
positive direction to the right.
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 Fall '08
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 Physics, Acceleration, Velocity, initial velocity, m/s

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