What two words are missing? An underground pipe is suspected to contain a blockage. A radioactive tracer is put into the pipe to assess the situation. The diagram shows the readings on a radioactivity detector different points above the ground. The readings never reach zero because is being detected.

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The boat's velocity relative to the riverbank can be resolved into two components. the component going north is 2.7 m/s and the component going west is 1.2 m/s.we add these two vectors and then find the magnitude of the resultant to get the speed.the magnitude of the resultant vector from adding can be obtained by the pythagorean theorem.    to two significant figures, the boat's speed relative to the riverbank is 3.0 m/s.