(f) The answer to part (a) is given by the slope of the straight line between
t
= 2 and
t
= 3
in this
x
vs
t
plot. The answers to parts (b), (c), (d) and (e) correspond to the slopes of
tangent lines (not shown but easily imagined) to the curve at the appropriate points.
17. We use Eq. 22 for average velocity and Eq. 24 for instantaneous velocity, and work
with distances in centimeters and times in seconds.
(a) We plug into the given equation for
x
for
t
= 2.00 s and
t
= 3.00 s and obtain
x
2
=
21.75 cm and
x
3
= 50.25 cm, respectively. The average velocity during the time interval
2.00
≤
t
≤
3.00 s is
v
x
t
avg
cm
cm
s
s
==
−
−
Δ
Δ
50 25
2175
300
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This note was uploaded on 09/03/2009 for the course PHYS 1200 taught by Professor Stoler during the Spring '06 term at Rensselaer Polytechnic Institute.
 Spring '06
 Stoler
 Physics, Work

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