Question Number 126921 by sdfg last updated on 25/Dec/20
Commented by mr W last updated on 25/Dec/20
$$\overset{\rightarrow} {{C}}=\overset{\rightarrow} {{A}}+\overset{\rightarrow} {{B}} \\ $$$$\overset{\rightarrow} {{C}}'=\frac{\mathrm{1}}{\mathrm{2}}\overset{\rightarrow} {{A}}+\frac{\mathrm{1}}{\mathrm{2}}\overset{\rightarrow} {{B}}=\frac{\mathrm{1}}{\mathrm{2}}\left(\overset{\rightarrow} {{A}}+\overset{\rightarrow} {{B}}\right)=\frac{\overset{\rightarrow} {{C}}}{\mathrm{2}} \\ $$