Physics vector problem

Question

What is the direction equivalent to – [40° W of S]?

a) [40° E of S]

b) [40° W of N]

c) [40° E of N]

d) [50° S of W]

e) [50° E of N]

Answer 1

We will go 40^o clockwise to the west of South which is equivalent to the 50^o East of West (counter-clockwise) as 50 & 40 complete each other to 90.