Posted by Anmol on Saturday, October 15, 2011 at 2:08am.
If we consider the direction across the river as 0deg, then the resultant velocity of the boat is
(angle a is 25.7 deg)
(7.2 cos a, 7.2 sin a) + (0,14.1 sin -90)
= (6.386,3.122) + (0,-14.1)
= (6.386, -10.978)
which is 10.835 in the direction -59.49 deg
So, now we want a course in the same direction, where the x-distance is 24.5
If d is the distance traveled, then 24.5/d = cos -59.45
d = 48.25
48.25/10.835 = 4.45 sec
I understand the method you used completely but when I went to enter in the answer it incorrect...any help?
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