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A body moves in a circular path at a constant speed of $$\pi\text{ m/s}$$. The magnitude of average velocity of this body for half a revolution is
In half a revolution the distance covered is $$\pi r$$ and the displacement is the diameter $$2r$$. The time taken is $$\frac{\pi r}{\pi} = r$$ seconds. So the average velocity is $$\frac{2r}{r} = 2\text{ ms}^{-1}$$.
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