The height of a football when punted into the air is given by the function: . The initial velocity of the football is , g is acceleration due to gravity (10 m/s^2), and t is time in seconds. If a football is kicked with an initial velocity of 20 m/s, then how long will it take to reach its maximum height?

(A) 0 m/s^2

(B) 1 m/s^2

(C) 2 m/s^2

(D) 3 m/s^2

(E) 4 m/s^2

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