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Two fixed frictionless inclined planes making an angle \( 30^{\circ} \) and \( 60^{\circ} \) with the vertical are shown in the figure. Two blocks
\( \mathrm{P} \) \( \mathrm{A} \) and \( \mathrm{B} \) are placed on the two planes. What is the relative

W vertical acceleration of \( A \) with respect to \( B \)
[AIEEE 2010]
(a) \( 4.9 \mathrm{~ms}^{-2} \) in vertical direction
(b) \( 4.9 \mathrm{~ms}^{-2} \) in horizontal direction
(c) \( 9.8 \mathrm{~ms}^{-2} \) in vertical direction
(d) Zero
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