The distance
"d=d_1+d_2=50+120=170\\:\\rm m"The displacement
"{\\bf s}={\\bf d}_1+{\\bf d}_2"where
"{\\bf d}_1=-50{\\bf i}+0{\\bf j},\\; {\\bf d}_2=0{\\bf i}-120{\\bf j}"Hence
"{\\bf s}=-50{\\bf i}+0{\\bf j}+0{\\bf i}-120{\\bf j}=-50{\\bf i}-120{\\bf j}"The magnitude of a displacement
"s=\\sqrt{(-50)^2+(-120)^2}=130\\:\\rm m"
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