Posted by Julia on Sunday, February 3, 2013 at 12:42pm.
at start u = u forever
Vi = Vi
u^2 + Vi^2 = 81 u^2
so
Vi^2 = 80 u^2
Vi = 8.94 u
tan A = Vi/u = 8.94
so
A = 83.6 degrees above horizontal
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