Writing in mathematics

Question

Describe the plan or steps to solving the problem below to help support your assertions:

a pinecone drops from a tree branch that is 20 feet above the ground. The function h = -16t^2 + 20 is used. If the height h of the pinecone is in feet after t seconds, at about what time does the pinecone hit the ground?

Answer 1

0 = -16t² + 20

0 = -4t² + 5

-5 = -4t²

1.25 = t²

±1.1180 ≈ t

Only positive value acceptable to time.

Answer 2

Gravity/fall=(t^2+t)/2*32.2=distance

" " " =20

t=.7216sec