During a short interval of time the speed \( v \) in \( \mathrm{m} / \mathrm{s} \) of an automob...

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During a short interval of time the speed \( v \) in \( \mathrm{m} / \mathrm{s} \) of an automobile is given by \( v=a t^{2}+b t^{3} \), where the time \( t \) is in seconds. The units of \( a \) and \( b \) are, respectively,
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