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P112 Fall 2008
Homework #2, due at your second section, Week
of Sep 812, 2008
Reading: 3.13.3, 3.5
Not all concepts will be covered in class – you are responsible
for all material in the reading and in the homework problems.
Problems:
1.
A car with an initial velocity v
0
brakes to a stop
with constant deceleration in a time t. If the initial
velocity was twice as large but the constant
deceleration was half as large, the time to stop would
be
A. 8t B. 4t C. 2t D. t E. 0.5 t
2.
A jet plane is flying at a constant altitude. At time
t
1
=0 it has components of velocity v
x
=90 m/s, v
y
=110
m/s. At the time t
2
= 30.0 s the components are v
x
=
170 m/s and v
y
=40 m/s.
a) Sketch the velocity vectors at t
1
and t
2
. How do
these vectors differ? For this time interval calculate
b) the components of the average acceleration;
c) the magnitude and the direction of the average
acceleration.
3.
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 Fall '07
 LECLAIR,A
 mechanics, Work

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