contestada

a one way road passes under an overpass in the shape of half an ellipse, 15 ft. high at the center and 20 ft wide. assuming a truck is 12 ft. wide what is the tallest truck that can pass under the overpass?

Respuesta :

The tallest truck that can pass under the overpass would be 9 feet in height :)

Answer:

The answer is 12 feet.

Step-by-step explanation:

Let the height of the truck be represented by y.

The ellipse has the equation [tex]\frac{x^{2} }{10^{2} } +\frac{y^{2} }{15^{2} } =1[/tex]

We have to find the y-coordinates when x is equal to 6 (half the width of the road)  

So,  [tex]\frac{36}{100}+\frac{y^{2} }{225} =1[/tex]

Multiplying throughout by 225 to get [tex]81^{2}+y^{2}=225[/tex]

Solving this we get, [tex]y^{2} =144[/tex]

Hence, y = 12

So, the tallest truck that will fit under the pass will be 12 feet tall.