If \( x=a t+b t^{2} \), where \( \mathrm{x} \) is in metre and \( t...

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If \( x=a t+b t^{2} \), where \( \mathrm{x} \) is in metre and \( t \) in hour \( (h r) \),
\( \mathrm{P} \) then unit of \( b \) will be

W
(1) \( m^{2} / h r \)
(2) \( m \)
(3) \( m / h r \)
(4) \( m / h r^{2} \)
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