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A car completes one round around a circular path whose radius is $r$ in time $t$. Find the speed of the car.
As shown in the above fig. The car completes one round along the circular path with radius $r$
The distance travelled by the car $=$ Circumference of the circular path
$=2\pi r$
Therefore, speed of the car$=\frac{distance}{time}$
$=\frac{2\pi r}{t}$
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