question_answer

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               [AFMC 1994]

A)             \[\sqrt{XY}\]             

B)             \[\frac{X+Y}{2}\]          

C)             \[\frac{{{X}^{2}}+{{Y}^{2}}}{2}\]            

D)             \[\frac{2}{\sqrt{{{X}^{2}}+{{Y}^{2}}}}\]