vuong (rmv294) – HW2 – bohm – (59970)
1
This
printout
should
have
10
questions.
Multiplechoice questions may continue on
the next column or page – find all choices
before answering.
001
10.0 points
A car traveling at 6.9 m/s accelerates 2.0 m/s
2
to reach a speed of 11.0 m/s.
How long does it take for this acceleration
to occur? Answer in units of s.
002
10.0 points
If your car goes from 0 mi
/
h to 50 mi
/
h in
6 s, what is your average acceleration?
Answer in units of
miles
h
·
s
.
003
10.0 points
A car, moving along a straight stretch of high
way, begins to accelerate at 0
.
0359 m
/
s
2
.
It
takes the car 70
.
6 s to cover 1 km.
How fast was the car going when it first
began to accelerate? Answer in units of m
/
s.
004
10.0 points
A ranger in a national park is driving at
54 km
/
h when a deer jumps onto the road
71 m ahead of the vehicle.
After a reaction
time of
t
s, the ranger applies the brakes to
produce an acceleration of

3
.
9 m/s
2
.
What is the maximum reaction time al
lowed if the ranger is to avoid hitting the
deer? Answer in units of s.
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 Spring '08
 COLAPRET
 Acceleration, General Relativity, maximum height hmax, positive vertical direction

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