General Relativity has nothing to do with light or electromagnetism at all. So how to gravitational waves know to travel at the speed of light?

This is because as fast as light is -- moving at the speed of light -- it isn't instantaneous: at 299,792.458 kilometers per second (186,282 miles per second), it requires that length of time to ...

If you want the instantaneous speed according to the definition 2, that would also be 20 m/s. It's all about definitions. Suppose we want to have a discussion about gardening.

Questions about a Rivian's top speed have swirled for a while. Early in the truck's production, someone reported an official top speed of 125 mph, and that number is still flying around the internet.

The design also includes instantaneous speed measurement. Traditional Features: We designed the pedometer using an AVR AT90S-2313 MCU, whose connection details (components and values) are shown in ...

Instantaneous speed is -- just as it sounds -- speed at a particular instant. If law enforcement catches you going over the speed limit at any time, you’ll get a ticket. Scoring loops measure average ...

Again, this is usually used as "instantaneous speed". Basically, this is how fast something is going. Velocity is a vector, and speed usually means the magnitude of this vector.

How Does Traction Control Work? The system must sense or infer both the instantaneous speed of each driven wheel and the net speed of the vehicle overall.