The motion of a particle is described by the equation P \( x=a+b t^...

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The motion of a particle is described by the equation
P \( x=a+b t^{2} \) where \( a=15 \mathrm{~cm} \) and \( b=3 \mathrm{~cm} / \mathrm{sec}^{2} \). Its

W instantaneous velocity at time \( 3 \mathrm{sec} \) will be
(1) \( 36 \mathrm{~cm} / \mathrm{sec} \)
(2) \( 18 \mathrm{~cm} / \mathrm{sec} \)
(3) \( 16 \mathrm{~cm} / \mathrm{sec} \)
(4) \( 32 \mathrm{~cm} / \mathrm{sec} \)
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