Posted by Samantha on Thursday, March 15, 2012 at 2:35pm.
mgh = 100
.5*9.8*h = 100
h=20.4m
now, knowing that h = 1/2 at^2 it should not be hard to come up with t = 2.04s
same answer if you combine the formulas to get
t^2 = 2E / mg^2
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