A textbook is launched horizontally out of the 6th floor physics classroom at Aviation High School with a velocity of 10 m/s. If air resistance is neglected and the textbook falls 20 meters before hitting the parking lot, how far from the base of the building does the textbook land? A)
14 m

B)
16 m

C)
40 m

D)
20 m

we have been given a quadratic function and we need to restrict the domain such that it becomes a one to one function.

we know that vertex of this quadratic function occurs at (5,2).

further, we know that range of this function is .

if we restrict the domain of this function to either or , it will become one to one function.

let us know find its inverse.

upon interchanging x and y, we get:

let us now solve this function for y.

hence, the inverse function would be if we restrict the domain of original function to and the inverse function would be if we restrict the domain to .