Acceleration is in the direction of the change in velocity, which points directly toward the center of rotation—the center of the circular path. This direction is shown with the vector diagram in the figure.
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Applying this centripetal acceleration formula the answer is: ac = v2 / r Therefore, r = v2 / ac = (1.1m/s)2 / 3.8 m/s2 = 0.32m Do It Yourself 1. An Object is Travelling in a Circle at a Constant