x (b) 2.461/2 suomissions used s Save 4.14.11 Submit 4.14.11 Section 23: Sample

Question

x (b) 2.461/2 suomissions used s Save 4.14.11 Submit 4.14.11 Section 23: Sample problem: relative velocity 4.23.3 You have a boat with a motor that propels it at vboat-4.5 m/s relative to the (1.50) water. You point it directly across the river and find that when you reach the other side, you have traveled a total distance of 27 m (indicated by the dotted line in the diagram) and wound up 11 m downstream. What is the speed of the current? (0/2 submissions used) m/s Save 4.23 3 Submit 4.23.3 Save allSubmit all 9 19:44

Explanation / Answer

width of river d = sqrt(27^2-11^2) = 24.66 m

time taken = d/Vb = 24.66/4.5 = 5.48 s

now speed of current = 11/5.48 = 2.01 m/s answer

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