A vector of magnitude 4 pointing NE is multiplied by -2. The result is a vector
(a) of magnitude 8 pointing NE (b) of magnitude -8 pointing NE (c) of magnitude 8 pointing SW (d) of magnitude -8 pointing SW
(a) of magnitude 8 pointing NE
(b) of magnitude -8 pointing NE
(c) of magnitude 8 pointing SW
(d) of magnitude -8 pointing SW