Speed measurements in the metric system are made in kphwhich stands for kilometers per hour, whereas mph stands for miles per hour, and is used in the Imperial System.
How fast an object is moving is its speed. When a direction is included along with the speed (for example, "driving 30mph heading west") that's the velocity of an object. Speed and velocity are different, at least in science.
Speed
speed
Speed
Usually, that would be a speedometer.
miles/kilometers per second/minute/hour
Speed
Velocity
speed
It is a satellite.
Speed
Usually, that would be a speedometer.
Its speed.
Motion of something determined by its mass and velocity
Stantaneous speed is how fast an object moves at any given time.
miles/kilometers per second/minute/hour
No, distance and speed are two separate measurements. Distance is how far an object moves relative to speed and time, and speed is how fast an object moves relative to time and distance.
When an object moves really fast it gains more mass because the centre of the object increases in density. This is why planets have such a large mass, because they travel so fast around the sun.