A car starts from home and reaches its destination which is $20 k m$ away. It returns back to home taking a total time of $2 h o u r s$ . The average velocity of the car is _____ $m s^{- 1}$ .

10

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20

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30

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0

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Solution

The correct option is D $0$
Given,
Distance between the home and destination $= 20 k m$ .
$∴$ Total distance covered $= 40 k m$
Total time taken $= 2 h o u r s$ .
Displacement $= 0$ (car returns to its initial point)

Avg Velocity $= \frac{t o t a l d i s p l a c e m e n t}{t o t a l t i m e t a k e n} = \frac{0}{2} = 0$

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20 k m

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