Question

A car runs at a constant speed on a circular track of radius 100 m, taking 62.8 seconds for every circular lap. The average velocity and average speed for each circular lap respectively is

Moderate

Solution

Distance travelled in one rotation (lap) = $2 πr$
$∴ A v e r a g e s p e e d = \frac{d i s \tan c e}{t i m e} = \frac{2 πr}{t}$
$= \frac{2 \times 3.14 \times 100}{62.8} = 10 m s^{- 1}$
Net displacement in one lap=0
Average velocity= $\frac{n e t d i s p l a c e m e n t}{t i m e} = \frac{0}{t} = 0$

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