In Exercises 19–22, r(t) is the position of a particle in space at time t. Find the angle between the velocity and acceleration vectors at time t = 0. 19. r(t) = (3t + 1)i + V3tj + t°k /2 t i + 162 )j 20. r(t) 21. r(t) (In (f² + 1))i + (tan¯' t)j + V² + 1 k 4 22. r() = (1 + ni +1 – n²j + 1 + t)³/½i + (1 – 13/2j + tk

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