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12. We use the constantacceleration equations of Table 21 (with the origin at the traffic
light), Eq. 95 for
x
com
and Eq. 917 for
G
v
com
. At
t
= 3.0 s, the location of the automobile
(of mass
m
1
) is
xa
t
1
1
2
2
1
2
2
40
30
18
==
=
..
m/s
s
m,
2
ch
bg
while that of the truck (of mass
m
2
) is
x
2
=
vt
= (8.0 m/s)(3.0s) = 24 m. The speed of the
automobile then is
()
2
1
4.0 m/s
3.0 s
12 m/s,
va
t
=
while the speed of the truck
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This note was uploaded on 05/17/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.
 Spring '08
 Any
 Physics, Acceleration, Mass, Light

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