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A simple pendulum of length / hangs from the roof of a train moving with uniform acceleration then

in the equilibrium position the pendulum

  (a) Leans back from the vertical by an angle tan-1 (g/a)

  (b) Leans back from the vertical by an angle tan-1(a/g)

  (c) Moves forward from the vertical by an angle tan-1(a/g)

  (d) Moves forward from the vertical by an angle tan-1 (g/a)

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