The speed at which a particle moves is measured by its?

Velocity

Explanation:

In the context of speed, this refers to the change of position in a fixed amount of time, and velocity provides more depth to that; it also gives direction, which makes sense when you eventually learn that the velocity is the derivative of the position.

In physics, velocity is prevalently used.

hi,

the answer is d, it has indefinite shape but definite volume.

hope this !

plasma is the state of matter where the substance is ionized and has no definite shape or volume. the fact of being ionized makes the substance a good electrical conductor.