A body travels 200 cm in the first two seconds and 220 cm in the next four seconds. The average speed of the body for the entire journey is .

0.7 c m s^{- 1}

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0.7 m s^{- 1}

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0.5 m s^{- 1}

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Solution

The correct option is B $0.7 m s^{- 1}$
Total distance travelled = 200+220 =420 cm = 4.2 m

Total time taken= 2 + 4 = 6 sec

speed = $\frac{t o t a l d i s t a n c e t r a v e l l e d}{t o t a l t i m e} = \frac{4.2}{6} = 0.7 m s^{- 1}$

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