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6.
(a) Using the fact that time = distance/velocity while the velocity is constant, we Fnd
v
avg
=
73
.
2m+73
.
2m
73
.
1
.
22 m
/
s
+
73
.
3
.
05 m
=1
.
74 m
/
s
.
(b) Using the fact that distance =
vt
while the velocity
v
is constant, we Fnd
v
avg
=
(1
.
22 m
/
s)(60 s) + (3
.
05 m
/
s)(60 s)
120 s
=2
.
14 m
/
s
.
(c) The graphs are shown below (with meters and seconds understood). The Frst consists of two (solid)
line segments, the Frst having a slope of 1
.
22 and the second having a slope of 3
.
05. The slope of
the dashed line represents the average velocity (in both graphs). The second graph also consists of
two (solid) line segments, having the same slopes as before – the main di±erence (compared to the
Frst graph) being that the stage involving higher-speed motion lasts much longer.

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