A point moves in a straight line so that its displacement \( x \) metre at time \( t \) second i...

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A point moves in a straight line so that its displacement \( x \) metre at time \( t \) second is given by \( x^{2}=1+t^{2} \). Its acceleration in \( \mathrm{m} \mathrm{s}^{-2} \) at time \( t \) second is
(1) \( \frac{1}{x^{3}} \)
(2) \( \frac{-t}{x^{3}} \)
(3) \( \frac{1}{x}-\frac{t^{2}}{x^{3}} \)
(4) \( \frac{1}{x}-\frac{1}{x^{2}} \)
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