# An airplane has an effective wing surface area of 20 m2 that is generating the lift force.

An airplane has an effective wing surface area of 20 m2 that is generating the lift force. In level flight the air speed over the top of the wings is 61 m/s, while the air speed beneath the wings is 55 m/s. What is the weight of the plane?(Note: The density of air is 1.29 kg/m3)