over the towers of a bridge a cable is hung in the form of a parabola, have their tops 30 meters above the road way are 200 meters apart. If the cable is 5 meters above the road way at the centre of the bridge, then the length of the vertical supporting cable 30 meters from the centre is

over the towers of a bridge a cable is hung in the form of a parabola,

1.	over the towers of a bridge a cable is hung in the form of a parabola, have their tops 30 meters above the road way are 200 meters apart. If the cable is 5 meters above the road way at the centre of the bridge, then the length of the vertical supporting cable 30 meters from the centre is
Answer» `x^2=4a(y-b)` `x^2=4a(y-5)` `100*100=4a(30-5)` a=100 `x^2=400(y-5)` At x=30 `900=400(y-5)` `y=29/4m`

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