Two fixed frictionless inclined plane ma...

Two fixed frictionless inclined plane making angles `30^(@)` and `60^(@)` 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 with respect to B ?

`4.9 ms^-2` in vertical direction

`4.9 ms^-2` in horizontal directions

`9.8 ms^-2` in vertical direction

zero

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