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Gre4nikov [31]
3 years ago
14

After t seconds, a ball in the air from the ground level reaches a height of h feet given by the equation h= 144t-16t^2 . After

how many seconds will the ball hit the ground before rebounding?
Mathematics
1 answer:
Effectus [21]3 years ago
3 0
H=0
Therefore:
144t-16t²=0
t (144-16t)=0
We have two equations:
1)
t=0    (when the ball is released)
2)
144-16t=0
-16t=-144
t=-144 / -16=9  (this is the time )

Answer: the ball hit the ground in 9 s. 
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