The position of an object moving along \( X \)-axis is given by \( x(t)=a-b t^{2} \), where \( a...

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The position of an object moving along \( X \)-axis is given by \( x(t)=a-b t^{2} \), where \( a=8.5 \mathrm{~m}, b=2.5 \mathrm{~ms}^{-2} \) and \( t \) is measured in seconds.
For the above situation, match the Column I (speed/velocity) with Column II (value) and select the correct answer from the codes given below.
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