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  4. A body is moving along the circumference of a circle of radius R and completes half of the revolution. Then, the ratio of its displacement to distance is

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Q. A body is moving along the circumference of a circle of radius $R$ and completes half of the revolution. Then, the ratio of its displacement to distance is

Motion in a Straight Line

Solution:

Displacement is the minimum distance between the start and end point. Hence, the displacement in this case will be the diameter of the circle, i.e., $2 R$. Distance is the length of path covered by the particle/object. Here, the distance will be $\pi R$. Therefore, the ratio of displacement to distance is $2: \pi$