CBSE Class 11-science Answered
conic sections
Asked by | 23 Sep, 2008, 07:07: PM
Expert Answer
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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 | 19 Dec, 2008, 08:09: PM
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