I Might Just Know What I'm Talking About
Join Date: Sep 1999
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Re: O/T Water Rocket calculations
12 seconds is a darn long time! Throw a rock up into the air and count how long it stays up there. Not 12 seconds.
The only error in the post is that the units for acceleration are ft/s^2, not ft/s.
So, using half the time to rise, and half to fall, we can find the distance fallen in 6 seconds due to gravity, starting from rest.
1/2 * 32.2 ft/sec^2 x (6 sec)^2
units for seconds-squared cancel out, leaving us units of feet.