Physics

Problem

A student sketches the following velocity–time graph for a scooter: • From

t = 0\,\text{s}

t = 4\,\text{s}

: a horizontal line at

5\,\text{m/s}

. • At

t = 4\,\text{s}

: an abrupt vertical jump to

15\,\text{m/s}

. • From

t = 4\,\text{s}

t = 8\,\text{s}

: a horizontal line at

15\,\text{m/s}

. The student claims that this represents “uniform acceleration for 4 s followed by uniform motion.” a. (a) Identify the error in the graph with respect to uniform acceleration. b. (b) Describe how the correct velocity–time graph should be drawn for this motion.

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