Ph 111.01
Fall, 2008
Solutions, Problem set 3a (6)
Problem 3 of this assignment  graphing problem.
Please note that since I can't
actually have you submit a graph in WebAssign, this problem instead asks you to answer
questions about what your graph looks like. When asked about the shape of the graph,
please use the following choices:
Bob starts off at rest at x=0. Then, Bob increases his speed at a constant rate, so that after
4 s, he is travelling
9
m/s in the +x dir. Bob then decreases his speed at a constant rate for
2 s, ending up back at rest.
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Draw Bob’s v
x
vs. t graph, and use it to answer the following:
· at t=0 s, v
x
= 0
m/s
· from 0 s to 4 s, this graph is most nearly shaped like: B
· at t=4 s, v
x
= 9
m/s
· from 4 s to 6 s, this graph is most
nearly shaped like: C
· at t=6 s, v
x
= 0
m/s
Answers:
•
At t = 0 Bob is at rest, so the
answer is 0 m/s.
•
From 0 to 4 seconds the
graph goes steadily
upwards, like B.
•
At 4 seconds the graph
peaks out at 9 m/s.
•
From 4 to 6 seconds the
graph goes steadily down,
like
•
And at the end, the velocity is down to zero.
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 Fall '08
 Staff
 Acceleration, Velocity, m/s

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