Sagot :
When an object changes position in relation to a reference point, it is said to be in motion. Objects that are fixed in relation to the Earth, such as a building, a tree, or a sign, serve as useful reference points.
When an object changes position in relation to a reference point, it is said to be in motion. Objects that are fixed in relation to the Earth, such as a building, a tree, or a sign, serve as useful reference points.