For number 3, express the final answer up to four significant figures. Rounding up should be applied in the final answer only. 3. Given three vectors: A = 2.0 km at 40 B = 587 m at 120 C = 1500 m at 36 D = 800 m at 40 (a) Do a rough sketch of the vectors using head-to-tail method. (b) Calculate the resultant vector (both magnitude and direction) R = A + B + C + D. Express the answer in kilometers