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pedrozac81
30.07.2019 •
Mathematics
Arock is thrown from the top of a tall building. the distance, in feet, between the rock and the ground x seconds after it is thrown is given by f(x)=-16x62-4x+382 how long after the rock is thrown does it hit the ground
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Ответ:
We have then:
f (x) = - 16x ^ 2-4x + 382
The moment the rock hits the ground we have f (x) = 0
0 = -16x ^ 2-4x + 382
We solve the polynomial looking for its roots which are:
x1 = -5.012803699004288
x2 = 4.762803699004288
We ignore the negative root. The solution is:
x = 4.76
it hits the ground 4.76 s after is thrown
Ответ:
2/5 X 1/5
2/25
8%