A jogger travels a route that has two parts. the first is a displacement a of 2.95 km due south, and the second involves a displacement b that points due east. the resultant displacement a + b has a magnitude of 4.45 km. (a) what is the magnitude of b, and (b) what is the direction of a + b as a positive angle relative to due south? suppose that a - b had a magnitude of 4.45 km. (c) what then would be the magnitude of b, and (d) what is the direction of a - b relative to due south?