A 0.1 kg mass is connected to a spring with a spring constant of 100 N/m. The spring is stretched a displacement of 0.2 meters and released. What is the total energy in this system?

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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.

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