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The horizontal acceleration a that shoul...

The horizontal acceleration a that should be given to a smooth inclined plane of angle `theta = sin^-1(1/z)` where z > 1, to keep a block stationary relative to the inclined plane as shown in the figure, is

A

`g/sqrt(z^2-1)`

B

`gsqrt(z^2-1)`

C

`gsqrt(1+z^2)`

D

`g/sqrt(z^2+1)

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