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

A point moves in a straight line so that its displacement'`x`'metre at a time `t` second is such that `t=(x^(2)-1)^(1/2)`.Its acceleration in `m/s^(2)` at time `t` second is ( `(1)/(x)` ( `(1)/(x^(2))` ( `(1)/(x^(2))`

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