(a) An object moves from x=8 m to x=3 m. Write a vector equation
for the displacement.
D
^
r
=(3 m-8 m)
^
i
=-5 m
^
i
(b) If it took 2.5 s for the object to be displaced, calculate its
average velocity.
vx,av=-5 m
^
i
/2.5 s=-2 m/s
^
i
(c) If the object returned to its original position while taking
an additional 3.5 s to get there, what was the object's average speed over
the entire distance traveled?
speedav=10 m/6 s=1.7 m/s
(d) The position of a moving object is described by the following
graph. When is the object at x=3 m?
t1=30 s
t2=60 s
t3=80 s
(e) Is the object always moving in the +x-direction?
ANS: NO
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