The resultant is what you get when you add together all the vectors.
You only listed one vector, so the sum of all of it is the same as the
one vector. The resultant is 300n at 0 degrees.
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If the scalar is > 1 the resultant vector will be larger and in the same direction. = 1 the resultant vector will be the same as the original vector. between 0 and 1 the resultant vector will be smaller and in the same direction. = 0 the resultant vector will be null. If the scalar is less than 0, then the pattern will be the same as above except that the direction of the resultant will be reversed.
by method of finding resultant
It is very much so possible, 2 - 2 = 0 and neither one of the subtractants are 0 but resulted in a zero resultant.
If the forces are all normal (at right angles to) the sides the resultant is 0 (they all cancel each other out ).
The resultant decreases from 0 degrees until the angle is 180 degrees and then increases until 360 degrees.