A particle executes S.H.M. with amplitude $A$ and time period $T$. The displacement of the particle when its speed is half of maximum speed is $\frac { \sqrt { x } A } { 2 }$. The value of $x$ is
A particle executes S.H.M. with amplitude $A$ and time period $T$. The displacement of the particle when its speed is half of maximum speed is $\frac { \sqrt { x } A } { 2 }$. The value of $x$ is