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How long will it take for a firework to fall back to earth?

The calculated trajectory of a firework is given by the function


asked Jul 11, 2017 in Algebra by Stacy

1 Answer

When dealing with questions like this, you need to set s(t) = 0,  then solve the quadratic equation for t.

-0.8t2 + 50t + 10 = 0

t ≅ -0.199 or 62.699


t = 62.699 sec

answered Jul 11, 2017 by Mia