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Two frictionless inclined planes making ...

Two frictionless inclined planes making an angle of `30^@` and `606@` with the vertical are shown in the figure.
Two blocks A and B are placed on the two planes. What is the relative vertical acceleration of A w.r.t. B ?

A

`4.9 m s^(-2)` in vertical direction

B

`4.9 m s^(-2)` in horizontal direction

C

`9.8 m s^(-2)` in vertical direction

D

zero.

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