Two vectors A and B are equal if they have the same magnitude and the same direction . this property allows us to translate a vector parallel to itself in a diagram without affecting the vector . In fact , for most purposes, any vector can be moved parallel to itself without being affected .
can you give me an example of that point
Take a drawing of a parallelepiped, say a dice. Then any two parallel sides of any of the dice's faces represent exactly the same vector. Thus, you have 4 parallel sides in a dice which, as sides, are all different, but which as vectors are the same thing.
When two or more vectors are added , they must all have the same units . It would be meaningless to add a velocity cector to a displacement vector .
what that mean ?