Vectors · relative velocity · manipulative

Train, walker, tip to tail

The person’s ground velocity is walk-relative-to-train plus train-relative-to-earth — tip to tail, not a slogan.

vB/E train vA/B walk on train vA/E person on ground

Drag the coloured tip dots (not the labels) · the train picture swivels with vB/E

Who is who

B — the train (frame riding with the carriage)
A — the person walking on the train
E — the ground (Earth)

Identity

Velocities