I am currently studying vectors and i have a big confusion about something..
There are questions in the section such as:
A yacht is sailing at a speed of 34 knots and a wind encounters from the south east, find the final speed and direction of the yacht..
Now.. to work this question out you draw the triangle and use sin and cosine rules to work out the unknowns..
But i also get these questions and they require a different approach to solve:
A yacht is moving 10kmph in a south easterly direction and encounters a 3 kmph current from the north. Find the actual speed and direction of the yacht.
Now these questions are very similar but this question requires a different approach to solve using vectors which involves finding the vector in component form and adding the coordinates, then finding the scalar product to find the answer for the speed...
My problem is when i use one approach for a question (such as the second approach on the first question) i get an incorrect answer and vise versa
can anyone explain please..