In general for three objects A (e.g. Galilei on the shore), B (e.g. ship), C (e.g. falling body on ship) the velocity vector u {\displaystyle \mathbf {u} } of C relative to A (velocity of falling object as Galilei sees it) is the sum of the velocity u ′ {\displaystyle \mathbf {u'} } of C relative to B (velocity of falling object relative to ship) plus the velocity v of B relative to A (ship's velocity away from the shore). The addition here is the vector addition of vector algebra and the resulting velocity is usually represented in the form