Question: If a ball is thrown vertically upward with a velocity of144ft/s, then its height after t seconds is s =144 t 16 t 2 .

If a ball is thrown vertically upward with a velocity of144ft/s, then its height aftertseconds iss=144t16t2.

(a) What is the maximum height reached by the ball?

ft

(b) What is the velocity of the ball when it is320ft above the ground on its way up? (Consider up to be the positive direction.)

ft/s

What is the velocity of the ball when it is320ft above the ground on its way down?

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