Читать книгу Physics I For Dummies - Steven Holzner - Страница 58

You can calculate the units of acceleration easily enough by dividing velocity by time to get acceleration:

In terms of units, the equation looks like this:

Distance per time squared? Don’t let that throw you. You end up with time squared in the denominator because you divide velocity by time. In other words, acceleration is the rate at which your velocity changes, because rates have time in the denominator. For acceleration, you see units of meters per second², centimeters per second², miles per second², feet per second², or even kilometers per hour².

It may be easier, for a given problem, to use units such as mph/s (miles per hour per second). This would be useful if the velocity in question had a magnitude of something like several miles per hour that changed typically over a number of seconds.