Explain how the velocity of the aeroplane will change in the vertical direction

Alfred pushes on a heavy box, but cannot move it. the box has a lot of inertia motion friction gravity

The ratio of lift to drag l/d for a wing or airfoil is an important aerodynamic parameter, indeed, it is a direct measure of the aerodynamic efficiency of the wing. if a wing is pitched through a range of angle of attack, l/d first increases, then goes through a maximum, and then decreases. consider an infinite wing with an naca 2412 airfoil. estimate the maximum value of l/d. assume that the reynolds number is 9x10^6.

What is the rate of 12 liters of water moving through a water hose in 4.0 minutes?