1 answer
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h = Hi + Vi t - 4.9 t^2
0 = 8 + 3 t - 4.9 t^2
t = [ -3 +/- sqrt (9+157) ]/-6
t = [ - 3 + / - 12.9 ] / -6
= -.5 +/- 2.15
= 1.65 seconds