Three radio-equipped plumbing vans are broadcasting on the same frequency f0. Van 1 is moving north of van 2 with speed v, van 2 is fi xed, and van 3 is moving west of van 2 with speed v. What frequency does van 3 hear from van 2; from van 1?
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Three radio-equipped plumbing vans are broadcasting on the same frequency f0. Van 1 is moving north of van 2 with speed v, van 2 is fi xed, and van 3 is moving west of van 2 with speed v. What frequency does van 3 hear from van 2; from van 1?
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