A small block of mass \( m \) is pushed on a smooth track from position \( A \) with a velocity ...

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A small block of mass \( m \) is pushed on a smooth track from position \( A \) with a velocity \( 2 / \sqrt{5} \) times the minimum velocity required to reach point \( D \). The block will leave the contact with track at the point where normal force between them becomes zero.
P
W
When the block reaches point \( B \), what is the direction (in terms of angle with horizontal) of acceleration of the block?
(1) \( \tan ^{-1}\left(\frac{1}{2}\right) \)
(2) \( \tan ^{-1}(2) \)
(3) \( \sin ^{-1}\left(\frac{2}{3}\right) \)
(4) The block never reaches point \( B \).
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