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A girl walks along a straight path to dr...

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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As velocity time graph is a striaght line, velocity of the girl is constant `= ("displacement")/("time") = (100)/(50) = 2 m//s`.
Symmetry of displacement-time graph shows that the girl returns to her initial position with the same velocity in opposite diretion. Therefore, velocity-time graph is as shown in Figure.
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