With the aid of an intermediary reference frame, it can be computed. This can be expressed simply as the vector sum of the velocities. v AB = v A - v B is how the relative velocity formula is written.
The vector difference between the velocities of two objects will be the relative velocity. Body A's relative velocity with respect to body B's is equal to body A's velocity minus body B's velocity. The observer's velocity, for example, while floating on an inner tube and drifting downstream with the current, can be used to calculate the boat's velocity in relation to the water, or vBW. The boat flows downstream with the river when the engine is shut off, and v BW is zero.
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