Terminal Velocity
The constant maximum speed attained by a falling body when upward aerodynamic drag equals downward gravitational force.
Governing formula
v_t = √(2 m g / (ρ A Cd))
SI unit
m/s
In depth
At terminal velocity, net force and acceleration become zero, and velocity remains constant.
Examples in the real world
A skydiver falling in belly-to-earth spread position reaching terminal velocity of approximately 55 m/s (200 km/h).