The displacement of a particle moving along an \( x \) axis is given by \( x=18 t+5.0 t^{2} \), ...

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The displacement of a particle moving along an \( x \) axis is given by \( x=18 t+5.0 t^{2} \), where \( x \) is in meters and \( t \) is in seconds. Calculate the instantaneous velocity at \( t=2.0 \mathrm{~s} \) and the average velocity between \( t=2.0 \mathrm{~s} \) and \( t=3.0 \mathrm{~s} \)
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