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Apr 8 at 12:07 vote accept Majid
Apr 6 at 15:05 comment added JEB the former is an abstract subscript standing for all velocity subscripts, and $c=1$ is, as aways, the speed of light.
Apr 6 at 3:36 history edited Qmechanic CC BY-SA 4.0
edited tags; edited title
Apr 5 at 16:45 answer added Eli timeline score: 0
Apr 4 at 18:32 comment added Majid @JEB what are v_i and c?
Apr 4 at 18:29 history edited Majid CC BY-SA 4.0
added 31 characters in body
Apr 4 at 18:15 history edited gandalf61
rmv irrelevant tags
Apr 4 at 18:11 comment added JEB Since you stipulate that the velocity of the boat in the water's frame ($\vec v_b$) is constant, nothing else matters. The velocity is $\vec v =\vec v_b + \vec v_{current}$ in all frames, assuming $v_i \ll c$, so the answer is $\vec P + \vec vt$.
Apr 4 at 18:02 history asked Majid CC BY-SA 4.0