**4. A student needs to get directly across a river that
is 92 m wide. She is standing on the southern bank and has a
boat that can travel at a speed of 4.0 m/s, but the current is
travelling at 2.5 m/s [E]. [A-5] (a) What is the resultant velocity
of the boat if she points it straight across the
river? **

**(b) How far downstream is she away from her destination
after reaching the other bank of the river?**

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a) So resulant velocity vec(V)_(R)= vec(V)_(b gamma)+ vec(V_(gamma))=> vec(V_(R))=4 hat(ȷ)+2.5 hat(ı):'V_(R)=sqrt(4^(2)+(2.5)^(2))quad:'V_(R)=4.7 ... See the full answer