Question

a particular is moving in a circular path of radius r. what will be the displacement of it after half a circle​

Answer 1

After the particle covers half path of the circle, the displacement can be easily calculated by measuring the distance between initial and final points. Displacement after half circle = AB=OA + OB Hence, the displacement after half circle is 2r.

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Answer 2

radius of cirle =r

displacement = 2r = diameter of cirle