when does the ball reach the ground

a person standing on the balcony of a building throws a ball directly upward. the height of the ball as measured from the ground after t second is given by h=-16t^2+64t+768. when does the ball reach the ground

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1 Answer

y=-16t^2 +64t +768=0

yuze quadratik equashun tu get zeroes

get -5.211026 & +9.2111026 sekonds

positiv number=wen hit ground

negativ...wen kannon fire ball up in aer
by

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