A teacher has a habit of walking to and fro between the left and right ends of the class room at a uniform speed while lecturing. She pauses for a fixed interval of time, every time she reaches an end. Let the left and right ends of her path be at x =-L and x = +L respectively. If at t 0 she starts moving from the right end, which of the following x-t graphs describes her motion ?
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A teacher has a habit of walking to and fro between the left and right ends of the class room at a uniform speed while lecturing.
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