a car travels 15 kilometers west in 10 minutes. after reaching the destination, the car travels back to the starting point, again taking 5 minutes. what is the average velocity of the car?

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31-05-2016
Physics

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a car travels 15 kilometers west in 10 minutes. after reaching the destination, the car travels back to the starting point, again taking 5 minutes. what is the average velocity of the car?

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AL2006 AL2006 · Answer 1 · 2016-05-31T17:54:44+02:00

Velocity = (displacement) / (time)

'Displacement' is the distance between the start-point and end-point,
so the car's displacement is zero, and its average velocity is zero.

However, Speed = (distance covered) / (time to cover the distance).

The car covered a distance of 30 km in 15 minutes,
so its average speed is

(30km) / (0.25 hour) = 120 km/hr.

'Velocity' is not simply a word you use for 'speed' when
you want to sound smarter. They're two different things.