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A^2 = 15^2 + (-4)^2 = 241---> A= ?241 = 15.52
B^2 = 2^2 + 8^2 = 68 ---> B = v68 = 8.25
its resultan at the x axis ---> Rx = 15 + 2 = 17 km
Its resultan at the y axis ---> Ry = -4 + 8 = 4 km
R^2 = (Rx^2 + Ry^2)
R^2 =17^2+ 4^2 = 305
--> R^2 = A^2 + B^2 + 2*A*B* cos ?
305 = 241 + 68...
