Kilometers per second (km/s)
Kilometers per second (km/s) is a unit of speed that measures the number of kilometers traveled in one second. It is occasionally used in astronomy and astrophysics where large distances are involved.
Kilometers per hour (kph, km/h)
Kilometers per hour (kph or km/h) is a unit of speed. Kph is a unit commonly used to express the speed of vehicles, such as cars and trains.