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I need help please help?

 Jan 15, 2019
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When the ball hits the ground   h  (height) will be ZERO.....right?

 

h= o      0 = -16t^2+64t

                  0 =-16t(t-4)      so either t = 0 when ball is on ground before it is launched, then t= 4 when it returns to the ground   

                                  4 seconds

 Jan 15, 2019
edited by ElectricPavlov  Jan 15, 2019

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