1. Calculate the velocity, speed, and direction: r(t) = (2 − 5t³)i + 7t²j + (1 − t¹)k d d d 2. Solve: a) & (u + 2v), & (u · v), đ (u × v), by using: dt dt dt u(t) = 2ti + 4k, v(t) = i + 2tj + 3t²k

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