Arturo O. answered • 08/30/18

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To find when it strikes the ground, set

s(t) = 0

and solve for t using the quadratic formula. You will get a negative and a positive solution. Discard the negative solution, since time starts at t = 0.

To find when it passes the top of the building on the way down, set

s(t) = 80,

s(t) = 80,

simplify the expression, and solve for t using the quadratic formula. You will get zero and a positive solution. The positive solution is the time it passes 80 ft on the way down.

You now have everything you need to solve the problem. Finish from here.

Arturo O.

Thank you, Lauren. How is your chemistry teaching and tutoring going these days? Are they keeping you busy as the new semester ramps up?

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08/30/18

Lauren H.

08/30/18