Posted by **Mike** on Friday, February 22, 2008 at 4:03pm.

A car increases its velocity from 12 miles per hour to 50 miles per hour in .3 hours. what was the car's acceleration.

- HELP -
**drwls**, Friday, February 22, 2008 at 4:08pm
If you want it in miles/hr^2, divide 48 miles/hr by 0.3 hours. If you want it in ft/s^2, m/s^2 or g's, you will have to do some conversions

- HELP -
**Damon**, Friday, February 22, 2008 at 4:13pm
change in velocity = (50-12) = 38 miles/hr

change in time = .3 hours

acceleration = (38 miles / hour) / .3 hours

which is:

127 miles/hour^2

Now no one uses miles per hour squared. Hardly anyone uses feet per second squared any more either but since we are evidently not using metric units here, we can just go to feet/s^2

We need to know there are 5280 feet in a mile and that there are 3600 seconds in an hour.

So

127 miles/hr^2 * 5280 ft/mile * 1 hr^2/3600^2 s^2

= 0.0517 ft/s^2

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