参数划分是指 An object is moving in space with an acceleration a(t) = -t i+3j+ (t – 3) k. Find the velocity vector v(t) and position vector r(t) of the object at any time t if at time t = 0, the object is at the point (0, 2. 1) and it has the velocity v(0) = i - j+ 2k. %3D 极性问题是 吁是和否的问 please ignore the background text Bartleby and solve black part only

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