a spider is crawling on a wall. first it crawls 1 meter up, then 1 meter to the left , and then 1 meter down. what is its total displacement?

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Displacement means the straight distance from the start point to the end point, no matter what route was followed along the way. The spider ends up 1 meter to the left of where he started, so his displacement for the trip is 1 meter. If he returns to the place where he started, then his displacement will be zero.

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