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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 Figure. Plot a velocity–time graph for the same.

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 Figure. Plot a velocity-time graph for the same.

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Explanation:-

If we observe the displacement time graph, for the part of the graph, where distance is increasing the graph is a straight line. It means that its slope is constant. Therefore, we can say its velocity will be constant for that time interval.

Later, its distance decreases with a constant slope. It means that it is moving with constant velocity in the opposite direction.

Mathematically, the opposite direction of velocity will be negative velocity. Hence, its v-t graph will look as shown below:

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