Posted by Wisdom on Thursday, November 10, 2011 at 4:05pm.
v = vi - g t
h = ho - 4.9 t^2
18 = 30 - 4.9 t^2
t^2 = 2.45
t = 1.56 seconds
v = 0 - 9.8* 1.56
v = - 15.3 m/s
or
15.3 m/s down
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