The phrase "at a speed equal" is correct and usable in written English.
It can be used when comparing speeds or rates in a context where two or more entities are moving or operating at the same speed.
Example: "The two cars raced down the track at a speed equal to each other, making it difficult to determine a winner."
Alternatives: "at the same speed" or "with equal speed".
More generally, he predicted the existence of electromagnetic radiation: coupled electric and magnetic fields traveling as waves at a speed equal to the known speed of light.
Sonic boom, shock wave that is produced by an aircraft or other object flying at a speed equal to or exceeding the speed of sound and that is heard on the ground as a sound like a clap of thunder.
In this sequence, the crawler moves horizontally on the step-like structure at a speed equal to that of (P_b), which is given by (dot{x_{22}(t)}).
For example, geostationary satellites orbit the Earth above the equator traveling at a speed equal to the Earth's rotation in order to maintain a constant location above the Earth.
In a medium, light usually does not propagate at a speed equal to c; further, different types of light wave will travel at different speeds.
In the early 1860s, Maxwell showed that, according to the theory of electromagnetism he was working on, electromagnetic waves propagate in empty space at a speed equal to the above Weber/Kohrausch ratio, and drawing attention to the numerical proximity of this value to the speed of light as measured by Fizeau, he proposed that light is in fact an electromagnetic wave.
Furthermore, he used his figures to give the first proof of the Merton theorem: the distance traveled in any given period by a body moving under uniform acceleration is the same as if the body moved at a uniform speed equal to its speed at the midpoint of the period.
Furthermore, Oresme used his figures to give the first proof of the Merton theorem, discovered at Oxford in the 1330's: the distance traveled in any given period by a body moving under uniform acceleration is the same as if the body moved at a uniform speed equal to its speed at the midpoint of the period (Clagett 1974, 225 226).
Regardless of swirl number, flame wrinkles propagate in helical spirals along the solution characteristics at a phase speed equal to the local tangential velocity.
As the museum noted, their mouths open underwater at a speed almost equal to that of a flying bullet.
The results presented in Figures 12 and 13 show the distribution of the normal force at 30%and95%5% span for an air speed equal to 15 m/s.
