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Given below are two statements : one is labelled as Assertion \( \mathbf{A} \) and the other is labelled as Reason R.
Assertion A: Body ' \( \mathrm{P} \) ' having mass \( \mathrm{M} \) moving with speed ' \( \mathrm{u} \) ' has head-on collision elastically with speed equal to ' \( 2 u^{\prime} \) after collision.
Reason R: During elastic collision, the momentum and kinetic energy are both conserved.
- In the light of the above statements, choose the most appropriate answer from the options given below - Options :
Both \( \mathrm{A} \) and \( \mathrm{R} \) are correct and \( \mathrm{R} \) is the correct explanation of \( \mathrm{A} \).
- Both \( \mathrm{A} \) and \( \mathrm{R} \) are correct but \( \mathrm{R} \) is NOT the correct explanation of \( \mathbf{A} \).
\( \mathrm{A} \) is correct but \( \mathrm{R} \) is not correct.
- \( A \) is not correct but \( R \) is correct.
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