Finding velocity given radius and acceleration

[KLI897]

Homework Statement

A car travels over a hump in the road of radius 20 meters. How fast is the car traveling if the occupants feel a net acceleration of 3.8 m/s²

Homework Equations

a = v²/r
v = √ar

The Attempt at a Solution

I did this but according to my teacher this isn't correct.
v = √(3.8 m/s²)(20 m)
v = 8.718 m/s

 

[haruspex]

Homework Statement

A car travels over a hump in the road of radius 20 meters. How fast is the car traveling if the occupants feel a net acceleration of 3.8 m/s²

Homework Equations

a = v²/r
v = √ar

The Attempt at a Solution

I did this but according to my teacher this isn't correct.
v = √(3.8 m/s²)(20 m)
v = 8.718 m/s

What acceleration would the occupants feel on a flat road? I agree it is not completely clear, but I would guess you are to interpret the felt acceleration in terms of the forces felt.