By comparing the object with a stationary object. For instance, we are standing apparently still on earth, yet by comparing our position against the sun and stars, we have proof that the earth is actually moving.
velocity of the object
object's velocity
When you know both speed and direction of an object in motion, you know the velocity of the object. Velocity is a vector quantity that describes how fast an object is moving and in what direction.
When you know both the speed and direction of an object's motion, you know its velocity. Velocity describes both how fast an object is moving (speed) and in what direction it is moving.
The magnitude and direction of the object's velocity vector.
If you know the speed and direction of the object's motion, then you know its velocity.
you need to know where the object is and where it is after a period of time
velocity
USE REFRENCE POINT ! >:(
An object is in motion if it changes position relative to a reference point over time. This change in position can be observed by tracking the object's movement. Additionally, motion can be detected by measuring the object's speed or velocity.
A reference frame is needed to determine an object's motion because motion is relative. An object is in motion only when compared to another object or a specific frame of reference. Without a reference point, it's impossible to determine if an object is moving or stationary.
The magnitude and direction of the object's velocity vector.