A hang glider is spiraling upward due to rapidly rising air along the curve r(t) = (3 cos t, 3 sin t, t). Find the times, if any, when the glider's acceleration is orthogonal to its velocity. Select one: O a.t = 0 |3D b. v and a are always orthogonal. O c.t= =k-,where k is any integer 4 O d. v and a are never orthogonal. e. t = - and t = T

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