Let $\mathbf { r } ( t ) = \langle 5 t , \sin 3 t , \cos 3 t \rangle$

question 72

Essay

Let $\mathbf { r } ( t ) = \langle 5 t , \sin 3 t , \cos 3 t \rangle$ . Show that the velocity vector is perpendicular to the acceleration vector.

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