Arturo O. answered • 06/25/18

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-16t

^{2}+ 83t + 5.2 = 0

Solve for t, keep only the positive solution, and get

t = 5.249 sec

(2)

-16t

^{2}+ 83t + 5.2 = 20

-16t

^{2}+ 83t - 14.8 = 0

Solve for t and get

t = 0.185 sec (on the way up)

t = 5.003 sec (on the way down)

Bobosharif S.

06/25/18