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**1. The problem statement, all variables and given/known data**

A car is driven at constant speed over a circular hill and then into a circular valley with the same radius. At the top of the hill the normal force on the driver from the car seat is 0. The driver's mass is 70.0 kg. What is the magnitude of the normal force on the driver from the seat when the car passes through the bottom of the valley??

**2. Relevant equations**

Fg - Fn = 0 ?

F = mv^2/r

**3. The attempt at a solution**

Stumped. I looked at this question and was like... wtf?

Only thing I can think of is Fg - Fn cannot equal zero because there is always Fg and if Fn is 0, then that equation doesn't make sense. But I don't know any better than this equation. I'm so confused!! =S