Velocity

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GED Science › Velocity

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A car travels due east for two hours and covers 144km. What is the car's average velocity in meters per second?

$\small \small 20\frac{m}{s}$

$\small 72\frac{m}{s}$

$\small 0.05\frac{m}{s}$

$\small 72000\frac{m}{s}$

Explanation

This question requires us to convert between units, then solve for the velocity.

First, convert kilometers to meters. There are 1000m in 1km.

$144km\times \frac{1000m}{1km}=144000m$

Then, convert hours to seconds. There are 60min in 1hr, and 60sec in 1min. In other words, there are 3600s in 1hr.

$2hr\times \frac{60min}{1hr}\times \frac{60s}{1hr}=7200s$

Now that you have both the distance in meters and the time in seconds, you can find the velocity. Velocity is equal to the distance divided by the time.

$v=\frac{d}{t}$

$v=\frac{144000m}{7200s}=20\frac{m}{s}$