The position of a toy locomotive moving on a straight track along the x axis is given by the equation

x = t^3 - 6t^2 + 9t, where x is in meters and t is in seconds. The net force on the locomotive is equal to zero when t is equal to

(A) zero

(B) 2 s

(C) 3 s

(D) 4 s

(E) 5 s

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