We have to deal with the additional vectorial structure called an inner product. In this type of additional structure each pair of vectors in the space is associated with a scalar quantity, called the inner product of the vectors.
In this case, the 2 forces are the 2 vectors above and if the 2 vectors are on the same dirrection and the same sense, the angle between 2 forces will be 0, so the maximum force will be reached at 0 degrees.
Explanation:
The inner product of the resultant force is
F1*F2=IF1I*IF2I*cos (F1,F2)
Wr know that the maximum value of the
IF1I*IF2I*cos (F1,F2) is given by the maximum value of the cos (F1,F2)=1 when the angle between F1 and F2 is 0.
So the right answer is a) 0 degrees
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