Q24. An object of mass 0.2 kg executes simple harmonic motion along x axis with frequency of $\left( \frac { 25 } { \pi } \right) \mathrm { Hz }$. At the position $x = 0.04 \mathrm {~m}$ the object has kinetic energy 0.5 J and potential energy 0.4 J . The amplitude of oscillation is $\_\_\_\_$ cm .