It is a vector with the same magnitude (size) but acting in the opposite direction.
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equilibrant
A null vector has no magnitude, a negative vector does have a magnitude but it is in the direction opposite to that of the reference vector.
vector equal in magnitude and opposite direction
The result will also be a velocity vector. Draw the first vector. From its tip draw the negative of the second vector ( ie a vector with the same magnitude but opposite direction). The the resultant would be the vector with the same starting point as the first vector and the same endpoint as the second. If the two vectors are equal but opposite, you end up with the null velocity vector.
vector