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A point moves in a straight line so its ...

A point moves in a straight line so its displacement `x` meter at time `t` second is given by `x^(2)=1+t^(2)`. Its acceleration in `ms^(-2)` at time `t` second is .

A

`(1)/(x^(3))`

B

`(1)/(x)-(1)/(x^(2))`

C

`-(t)/(x^(2))`

D

`-(t)/(x^(3))`

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A
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