40. A particle is moving in a vertical circle such that the tension in the string at the topmost point B is zero.
The acceleration of the particle at point A is
(g = 10 m/s2)
(1) 10root5 m/s^2
(2) 10root10 m/s^2
(3) 10 m/s2
(4) 5root10 m/s2
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