Question: In Exercises 1 9 2 2 , r ( t ) is the position of a particle in space at time t . Find the

In Exercises 1922, 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 +23tj +t
2
k

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