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Dmitriy789 [7]
3 years ago
13

What object is defined using a directrix and a focus? ...?

Mathematics
2 answers:
katovenus [111]3 years ago
5 0

Answer:

the answer is a parabola

otez555 [7]3 years ago
4 0
Conic sections are defined using a directrix (<span>a fixed line used in describing a curve or surface) and a focus, and those are: parabola, ellipse, and hyperbola. </span>
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Initial velocity: v o = 30 m/s
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h = v o * t + g * t² / 2
75 = 30 · t + 9.8 · t² / 2
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An equation is: y = 4.9 t² + 30 t - 75
4.9 t² + 30 t - 75 = 0
t_{12}= \frac{-30+/- \sqrt{900+1470} }{9.8}= \\  =\frac{-30+48.68}{9.8}
t = 1.9 s


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