By the time the vehicle reaches the surface of the earth, the potential and kinetic energy become zero.

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Aerodynamics basics include these topics: Finite control volume approach, infinitesimal fluid element, continuity and energy equations, pathlines, streamlines, streaklines, angular velocity, vorticity, strain and circulation. The four basic principles of aerodynamics are: Weight: The gravitational force acting on an object Lift: The force that pushes an aircraft upward Thrust: The force that moves an aircraft forward Drag: The force that holds an aircraft back  Here are some other basics of aerodynamics: Angle of attack: The angle between the chord line and the relative wind. Airfoils... Show more

By the time the vehicle reaches the surface of the earth, the potential and kinetic energy become zero.