$\text { The position vector } r ( t ) = \langle 7 t , 6 \cos t , 6 \sin t \rangle \text { describes the path of an object moving in }$

question 53

Multiple Choice

$\text { The position vector } r ( t ) = \langle 7 t , 6 \cos t , 6 \sin t \rangle \text { describes the path of an object moving in }$ space. Find the speed $s ( t )$ of the object.

• A) 21
• B) \(3 \sqrt { 7 }\)
• C) \(\sqrt { 93 }\)
• D) 149
• E) \(\sqrt { 85 }\)

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