Posted by ramesh reddy on Monday, March 9, 2009 at 11:37pm.
v = Vi + a t
we want the top where v = 0
Vi = +20
a = -10
so
0 = 20 - 10 t
t = 2 seconds to top
h = Vi t + (1/2) a t^2
h = 20 (2) - (1/2)(10) (2)^2
h = 40 - 20
h = 20
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