Ajogger travels a route that has two parts. the first is a displacement upper a overscript right-arrow endscripts of 2.50 km due south, and the second involves a displacement upper b overscript right-arrow endscripts that points due east. the resultant displacement upper a overscript right-arrow endscripts + upper b overscript right-arrow endscripts has a magnitude of 4.00 km. (a) what is the magnitude of upper b overscript right-arrow endscripts, and (b) what is the direction of upper a overscript right-arrow endscripts + upper b overscript right-arrow endscripts as a positive angle relative to due south? suppose that upper a overscript right-arrow endscripts - upper b overscript right-arrow endscripts had a magnitude of 4.00 km. (c) what then would be the magnitude of upper b overscript right-arrow endscripts, and (d) what is the direction of upper a overscript right-arrow endscripts - upper b overscript right-arrow endscripts relative to due south?