APFIVE Perpendicular Velocity and Acceleration Vectors
A particle moves in the xy-plane with position function r(t) = (3t²)i + (4t)j, where t is in seconds and r is in meters. At what time t > 0 is the particle’s acceleration perpendicular to its velocity?
A
t = 4/3 s
B
t = 2/3 s
C
t = 0 s
D
Never; they are always parallel or antiparallel
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