ps3a6 - Ph 111.01 Fall, 2008 Solutions, Problem set 3a (6)...

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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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a.) 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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ps3a6 - Ph 111.01 Fall, 2008 Solutions, Problem set 3a (6)...

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