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Earlier discussion
1 older comment kept for context.
Ogban Goodluck
g=10, t²=?,
Sy=1/2gt²
11.25=5t²(1/2=0.5*10=5)
Divide both side by coefficient of t²
11.25/5 = 5t²/5 (5 will cancel the 5 with t²)
t²=11.25/5 = 2.25
Square root of 2.25=1.5