Paheli moves on a straight road from point A to point C. She takes 20 minutes to cover a certain distance AB and 30 minutes to cover the rest of the distance BC. She then turns back and takes 30 minutes to cover the distance CB and 20 minutes. To cover the rest of the distance to her starting point. She makes 5 rounds on the road in the same way. Paheli concludes that her motion is,

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Only rectilinear motion

Only periodic motion

Rectilinear and periodic motion

Neither rectilinear nor periodic

answer is C.

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Detailed Solution

Paheli concludes that her motion is rectilinear and periodic.
Paheli moves in a straight line; therefore, the motion becomes rectilinear. Periodic motion is a motion in which an object repeats its position in a certain interval of time. Because she is moving fixed distances in a fixed interval of time; therefore, it is a periodic motion. So, the motion of Paheli is rectilinear and periodic motion.

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