87. The coordinate choices are made in the problem statement.
(a) We write the velocity of the armadillo as
&
vv
v
xy
=+
$$
ij
. Since there is no net force
exerted on it in the
x
direction, the
x
component of the velocity of the armadillo is a
constant:
v
x
= 5.0 m/s. In the
y
direction at
t
= 3.0 s, we have (using Eq. 211 with
0
0
y
v
=
)
a
t
v
F
m
t
yyy
y
y
=+ =+
F
H
G
I
K
J
=
F
H
G
I
K
J
=
00
17
12
30
43
..
bg
in SI units. Thus,
ˆˆ
(5.0m/s)i
(4.3m/s) j .
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 Spring '08
 Grassers
 Force, 5.0 m/s, 12 k, 6.4 m, 4.3 m/s, FG F IJ

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