Physics Van 3-site Navigational Menu

Physics Van Navigational Menu

Q & A: units of length

Learn more physics!

Most recent answer: 09/22/2011
Why do some projectile motion equations use -16t squared and some use -9.8t squared
- Nick (age 15)
Glenolden, PA, USA
You're talking about changes in height due to gravity. Neither of those expressions are correct, since they do not include units of length or time. The first would be

h= - 0.5*32 feet/s2 *time2

The second would be
h= -0.5*9.8 meter/s2 *time2

I'm not sure why one of the versions you gave included the factor of 0.5 and the other didn't.

Mike W.

(published on 09/22/2011)

Follow-up on this answer.