To summarize the car’s velocity information, let the
horizontal axis represent
time
, and the vertical axis
represent
velocity
.
The velocity is constant wherever the slope of the distance-vs-time
graph is constant.
The velocity changes only when the distance graph’s slope
changes.

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In the graph shown, is the velocity
constant for any time interval?
a)
Yes, between 0 s and 2 s.
b)
Yes, between 2 s and 4 s.
c)
Yes, between 4 s and 8 s.
d)
Yes, between 0 s and 8 s.
e)
No, never.
The velocity is a constant value between 0 s and 2 s.
The velocity is not
changing during this interval, so the graph has a zero (flat) slope.