Answer to Question #16649 in Mechanics | Relativity for manish
H = gt²/2 ==> t = √(2H/g) = √(2*15.24[m]/9.8[m/s²]) ≈ 3.11[s].
So, initial velocity of a ball must be
V = gt = 9.8[m/s²]*3.11[s] = 30.48[m/s].
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