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A car completes one round around a circular path whose radius is $r$ in time $t$. Find thee velocity of the car.
After one complete round, the car displacement will be zero because there is no change in position.
Therefore, the velocity of the car$=\frac{displacement}{time}$
$=\frac{0}{t}$
$=0$
Therefore, the velocity of the car is zero.
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