Find the Speed of a Particle with the Given Position $$\mathbf { r } ( t ) = 4 \sqrt { 2 } t \mathbf { i } + e ^ { 4 t } \mathbf { j } - e ^ { - 4 t } \mathbf { k }$$

Find the speed of a particle with the given position function.
$$\mathbf { r } ( t ) = 4 \sqrt { 2 } t \mathbf { i } + e ^ { 4 t } \mathbf { j } - e ^ { - 4 t } \mathbf { k }$$

A) $| v ( t ) | = \sqrt { 4 + 4 e ^ { t } + 4 e ^ { - t } }$
B) $| v ( t ) | = \left( e ^ { 4 t } + e ^ { - 4 t } \right)$
C) $| v ( t ) | = \sqrt { 4 + e ^ { 4 t } + e ^ { - 40 t } }$
D) $| v ( t ) | = 4 \left( e ^ { 4 t } + e ^ { - 4 t } \right)$
E) $| v ( t ) | = 4 \left( e ^ { t } + e ^ { - t } \right)$

Correct Answer:

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