If x=a t^2, y=2 a t, then d^2 y/d x^2 is :(A) -1/t^2 (B) 1/2 a t^2 (C) -1/t^3 (D) -1/2 at^3

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If x=a t^2, y=2 a t, then d^2 y/d x^2 is :(A) -1/t^2
(B) 1/2 a t^2
(C) -1/t^3
(D) -1/2 at^3

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