An object moves so that its position depends on time as x = +12 - 4t + t2. Which statement below is not true?
(a) The object is accelerating.
(b) The speed of the object is always decreasing.
(c) The object first moves in the negative direction and then in the positive direction.
(d) The acceleration of the object is +2 m/s2.
(e) The object stops for an instant at 2.0 s.
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