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Sonbull [250]
3 years ago
12

After t seconds a ball thrown in the air from ground level reaches a given

Mathematics
1 answer:
horsena [70]3 years ago
3 0

Answer:

9 sec.

Step-by-step explanation:

I think you wrote the equations incorrectly.  It probably is

h = -16t^{2} + 144t + 100

If that is true, then 100 = -16t^{2} + 144t + 100

                                    0 = -16t^{2} + 144t

                                       -16t(t - 9) = 0

                                            t = 0 or t = 9

 

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