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Finding Average Velocity

A point trave...

Question

A point traversed $3 / 4 t h$ of the circle of radius $R$ in time $t$ . The magnitude of the average velocity of the particle in this time interval is

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Solution

After ${\frac{3}{4}}^{t h}$ the position will be at $B$
displacement $:$ =√2R
$V_{a v g} = \frac{d i s p l a c e m e n t}{t i m e} = \frac{\sqrt{2} R}{t}$

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