==> $\frac{{{T_2}}}{{{T_1}}} = \sqrt {\frac{{{m_2}}}{{{m_1}}}} $
==> $\frac{5}{3} = \sqrt {\frac{{M + m}}{M}} $
==> $\frac{{25}}{9} = \frac{{M + m}}{M}$
==> $\frac{m}{M} = \frac{{16}}{9}$



${x}_{1}=5 \sin \left(2 \pi {t}+\frac{\pi}{4}\right)$ and ${x}_{2}=5 \sqrt{2}(\sin 2 \pi {t}+\cos 2 \pi {t})$
The amplitude of second motion is ....... times the amplitude in first motion.

