The horizontal acceleration that should be given to a smooth inclined plane of angle $sin^{-1}\, (1/l)$ to keep an object stationary on the plane relative to the inclined plane is
The horizontal acceleration that should be given to a smooth inclined plane of angle $sin^{-1}\, (1/l)$ to keep an object stationary on the plane relative to the inclined plane is
- A
$g/\sqrt {{l^2} - 1} $
- B
$g\sqrt {{l^2} - 1} $
- C
$\sqrt {{l^2} - 1} /g$
- D
$g/\sqrt {{l^2} + 1} $
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