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Q.

Which of the following speed-time (v-t) graphs is physically not possible?

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a

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b

All of these

c

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d

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answer is D.

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Detailed Solution

In all the given graphs, we have more than one value of speed corresponding to a single time. However, the graph must have a unique value of speed corresponding to a single time. Thus, 1st and 2nd graphs are not possible. In 3rd graph, speed is negative which is not possible. Hence all three graphs are not possible

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