Posted by MSM on Saturday, September 20, 2008 at 10:56am.
Q: a freely falling object requires 1.50s to travel the last 30.0m before it hits the ground . From what height above the ground did it fall ??
Pleazzzz help ....

physical  drwls, Saturday, September 20, 2008 at 11:09am
Let H be the height from which it is dropped. Let T be the time it takes to hit the ground. Solve these two simultaneous equations:
H = (1/2) g T^2
H30 = (1/2) g (T1.5)^2
By subtracting equations, H can be eliminated immediately:
30 = 1.5 g T  (1/2) g (1.5)^2
Solve for T first, then compute H.

physical  Diana, Wednesday, November 11, 2015 at 7:49pm
t= 2.79 H=38.1
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