MCQ
A false balance has equal arms. An object weigh $X$ when placed in one pan and $Y$ when placed in other pan, then the weight $W$ of the object is equal to
- A$\sqrt {XY} $
- ✓$\frac{{X + Y}}{2}$
- C$\frac{{{X^2} + {Y^2}}}{2}$
- D$\frac{2}{{\sqrt {{X^2} + {Y^2}} }}$
