A smooth tunnel is dug along the radius of earth that \( \mathrm{P} \) ends at centre. A ball is...

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A smooth tunnel is dug along the radius of earth that
\( \mathrm{P} \) ends at centre. A ball is released from the surface of earth along tunnel. Coefficient of restitution for collision between soil at
W centre and ball is 0.5. Calculate the distance travelled by ball just before second collision at centre. Given mass of the earth is \( M \) and radius of the earth is \( R \).
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