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Physics 21 Online
OpenStudy (anonymous):

While surveying a cave, a spelunker follows a passage 190m straight west, then 210m in a direction 45.0∘ east of south, and then 270m at 30.0∘ east of north. After a fourth unmeasured displacement, she finds herself back where she started. Use vector components to find the magnitude and direction of the fourth displacement.

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