speed
magnitude of velocity of motion
flow speed
length of the flow velocity vector, scalar
supersonic speed
speed that exceeds the speed of sound
rest
velocity of zero in a given reference frame
recessional velocity
the rate at which an astronomical object is moving away, typically from Earth
speed of gravity
physical constant equal to the speed of light
V speed
standard airspeed defined as important to aircraft operation
rate of climb
vertical speed of an aircraft
ground speed
horizontal speed of an aircraft relative to the ground
speed of electricity
Rate of travel of electric current
flank speed
true maximum speed of a vessel
average speed
average speed maintained by a vehicle in horizontal motion
wind speed
measure
subsonic speed
speed lower in magnitude than the speed of sound in a medium
airspeed
speed of an aircraft relative to air
preferred walking speed
locomotion speed of animals and humans
maximum speed
highest speed that can be reached by the vehicle in horizontal motion (perpendicular to the force of gravity)
phase velocity
rate at which the phase of the wave propagates in space
speed of sound
distance travelled during a unit of time by a sound wave propagating through an elastic medium
relativistic speed
speed at which relativistic effects become significant
radial velocity
component of the velocity in radial direction
muzzle velocity
speed of a projectile at the moment it leaves the muzzle of a gun
excessive speed
speed or velocity in excess of a safe limit