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91. We take +
x
in the direction of motion, so
v
=
F
H
G
I
K
J
=+
60
1000
3600
16 7
km / h
m/km
s/h
m/s
bg
.
and
a
> 0. The location where it starts from rest (
v
0
= 0) is taken to be
x
0
= 0.
(a) Eq. 27 gives
a
avg
= (
v
–
v
0
)/
t
where
t
= 5.4 s and the velocities are given above. Thus,
a
avg
= 3.1 m/s
2
.
(b) The assumption that
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 Spring '06
 Stoler
 Physics

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