Q.

A car travels 120 meters in 4 seconds to the west, then in the east it covers 60 meters in 2 seconds. Determine the average velocity of the car.

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a

30 m/s

b

10 m/s

c

25 m/s

d

20 m/s

answer is B.

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Detailed Solution

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Distance is the path covered during the journey.

Distance = 120 meters + 60 meters = 180 meters

Displacement is the shortest distance between the initial and final point.

Displacement = 120 meters – 60 meters = 60 meters

Time = 4 seconds + 2 seconds = 6 seconds

V = Displacement/Time

    = 60 meters/6 seconds

     = 10 meters/second

Therefore, the average velocity is 10 meters/second.

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