conic sections

Asked by  | 23rd Sep, 2008, 07:07: PM

Expert Answer:

according to the question OC = 15m and AB = 150m

now let the equation of parabola is x2 = -4ay assuming O as origin.

at A(-75,-15) lie on this parabola.

752 = -4a(-15) ==> 4a = 375

CD = 30m then so x-coordinate of D will be 30.

y = -302 / (375) = -2.4

so height at 30m from midpoint will be 15-2.4 = 12.6

Answered by  | 19th Dec, 2008, 08:09: PM

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