is it (d)??
. A particle, which is constrained to move along the x-axis, is subjected to a force in the same direction which varies with the distance x of the particle from the origin as F(x)= - kx + ax3 . Here k and a are positive constants. For x ≥ 0 the functional value of the potential energy U(x) of the particle is
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UP 0 DOWN 0 0 2