As shown below, two blocks with masses \( m \) and \( M \) \( (Mm) ...

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As shown below, two blocks with masses \( m \) and \( M \) \( (Mm) \) are pushed by a force \( F \) in both case I and
\( \mathrm{P} \) Case II. The surface on which blocks lie, is horizontal
\( \mathrm{W} \) and frictionless. Let \( R_{\mathrm{I}} \) be the force that \( m \) exerts on \( M \) in case \( I \) and \( R_{\amalg} \) be the force that \( m \) exerts on \( M \) in case II. Which of the following statements is true?
(2) \( R_{\mathrm{I}}=R_{\mathrm{II}}=F \)
(3) \( \quad R_{\mathrm{I}}R_{\mathrm{II}} \)
(4) \( \quad R_{\mathrm{I}}R_{\Pi} \)
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