The position vector of a particle r(t) = ti + 7 In j+k. Find the acceleration 5 +t vector at t = 1 7 a(1) = 20i - 36j - 14k a(1) = 20i +j + 14k %3D a(1) = 20i + j - 14k %3D 7 a(1) = 20i + 6j + 14k

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A: It is an important part of statistics. It is widely used.

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