Suppose is a vector of magnitude 4.5 unit due north. What is the vector (a) 3 (b) — 4

(a) Vector 3 means it is such a vector which has magnitude three times that of the magnitude of vector =3 x 4.5 =13.5 units and has the same direction, due north.

(b) The vector -4 is due (because of negative sign which represents opposite direction) with magnitude 4 times that of =4 x 4.5 =18 units.