The pendulum has both radial acceleration and tangential acceleration. The two are perpendicular. The radial acceleration is directed towards the center of the circle. The tangential acceleration is directed along the tangent of the trajectory. The resultant acceleration lies between the two vectors.
As the pendulum approaches or recedes from which position(s) is the acceleration vectoralmost parallel to the velocity vector?
A. position 2 only
B. positions 1 and 2
C. positions 2 and 3
D. positions 1 and 3
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