A girl walks along a straight path to drop a letter in letterbox and comes back to her initial posit

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7. MOTION

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A girl walks along a straight path to drop a letter in the letterbox and comes back to her initial position. Her displacement-time graph is shown in Fig. Plot a velocity - time graph for the same.

Option A

Option B

Option C

Option D

Solution

For the initial $50\,\sec $, velocity is $2 \,m/s$. After that, velocity drops of zero ; as shown by vertical line in graph.

For the next $50\,\sec $, velocity is taken in negative because displacement is becoming zero.

Standard 9

Science

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