Which of the following relations representing displacement \( \math...

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Which of the following relations representing displacement \( \mathrm{x} \) of a particle describes motion with constant acceleration ?
(1) \( \mathrm{x}=6-7 \mathrm{t}^{-2} \)
(2) \( x=3 t^{2}+5 t^{3}+7 \)
(3) \( x=9 t^{2}+8 \)
(4) \( x=4 \mathrm{t}^{-2}+3 \mathrm{t}^{-1} \)
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