Question

a particle is moving in anticlockwise direction along a circle of radius R. calculate the distance and displacement covered by the particle (1) from A to C (2) from A to D.
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Answer 1

Explanation:

 Given, after half the circle, the particle will reach the diametrically opposite point i.e., from point A to point 6. And we know displacement is shortest path between initial and final point. Hence, the displacement after half circle is 2r.