$$\text { Find the velocity, acceleration, and speed of an object with position vector } \mathbf { r } ( t ) = \langle \sqrt { t } , 8 + \sqrt { t } , 8 t \rangle \text {. }$$

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The Answer of $$\text { Find the velocity, acceleration, and speed of an object with position vector } \mathbf { r } ( t ) = \langle \sqrt { t } , 8 + \sqrt { t } , 8 t \rangle \text {. }$$