$m g h=\frac{1}{2} m v^{2}+\frac{1}{2} I \omega^{2}$
$m g h=\frac{1}{2} m v^{2}+\frac{1}{2} m k^{2} \omega^{2}$ where $k:$ radius of gyration
$m g h=\frac{\overline{1}}{2} m v^{2}+\frac{\overline{1}}{2} m v^{2} \frac{k^{2}}{r^{2}}$
$K E=\frac{P E}{1+k^{2} / r^{2}}$
$\Longrightarrow K E_{\text {ring}}: K E_{\text {coin}}: K E_{\text {solid} b a l l}=\frac{1}{1+1}: \frac{1}{1+1 / 2}: \frac{1}{1+2 / 5}$
$K E_{\text {ring}}: K E_{\text {coin}}: K E_{\text {solid} b a l l}=21: 28: 30$
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${x_1} = a\sin (\omega \,t + {\phi _1})$, ${x_2} = a\sin \,(\omega \,t + {\phi _2})$
If in the resultant wave the frequency and amplitude remain equal to those of superimposing waves. Then phase difference between them is
