A Frisbee is observed to fly nearly horizontally, which implies that the lift force must be approximately equal to the weight of the Frisbee. If the air speed over the top of the Frisbee is 9.0 m/s, what is the flow speed across the bottom? Assume the Frisbee has a mass of 0.15 kg.

Assume an ideal fluid (i.e., a fluid with no viscosity).