Question

Help!! Vă rog ............................

Answer 1

Cand barca merge in susul raului v=vb-va

d=v*t₁=>v=d/t₁=150/150=1=>vb-va=1  (1)

Cand barca merge in josul raului v=vb+va

d=v*t₂=>v=d*/t₂=150/30=5 =>vb+va=5   (2)

(1)+(2)=>2vb=6=>vb=6/2=3 m/s

vb+va=5=>va=5-vb=5-3=2 m/s