Why is the velocity of a person travelling to east is the velocity of the person w.r.t. ground ? скачать в хорошем качестве

Why is the velocity of a person travelling to east is the velocity of the person w.r.t. ground ?

Why is the velocity of a person traveling to the east is the velocity of the person with respect to ground but not with respect to wind? For example: In question A ship is travelling due east at 30 km/hr and a boy runs across the deck in a south west direction at 10 km/hr. Find the velocity of boy relative to sea. we consider the velocity of ship as the velocity of ship relative to sea? ---------------------------------------- Feel free to send any questions or feedback via the link below: https://forms.gle/4WESaWDsFZddRVHZ8 ----------------------------------------------------------------------------------------------------------------------------- Numerical solved in this channel are either found in public domain or sent by learners. The mathematician doesn’t hold any copyright upon them. But the video is protected under "Copyright Act, 2059 (2002)".