A string of length 1.3 m is oscillating in a standing wave pattern. If the tension in the string is 430 N, the string has a mass of 23 g/m, and the amplitude of the oscillations is 2.1 mm, what is the maximum speed of a point on the string when it is oscillating in the fundamental mode?

no. dot product   =0 when vecs at right angles

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i think it would be 5