Question 1185008
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A man can paddle a canoe at 3.2 m/s in still water. 
He is canoeing in a river where the current is flowing 2.8 m/s south. 
Find his {{{highlight(cross(velocity))}}} <U>speed</U> if he paddles 
(a) upstream in the north direction, 
(b) downstream in the south direction, 
(c) across the river in the east direction, and 
(d) across the river in the west direction.
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<pre>
(a)  3.2 m/s - 2.8 = 0.4 m/s.    <U>ANSWER</U>


(b)  3.2 m/s + 2.8 = 6.0 m/s.    <U>ANSWER</U>


(c)  {{{sqrt(3.2^2 + 2.8^2)}}} = {{{sqrt(18.08)}}} = 4.25 m/s  (approximately).    <U>ANSWER</U>


(d)  {{{sqrt(3.2^2 + 2.8^2)}}} = {{{sqrt(18.08)}}} = 4.25 m/s  (approximately).    (same as in (c))  <U>ANSWER</U>
</pre>

Solved.


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The structure of each formula fully describes its meaning,
so the formulas are SELF-EXPLANATORY.