The Position Vector of a Particle Is R(t) A) V(3) = 46i + 81j + 6k
B) V(3)

question 27

Multiple Choice

The position vector of a particle is r(t) . Find the requested vector.
- $\text { The velocity at } t = 3 \text { for } \mathbf { r } ( t ) = \left( 7 t ^ { 2 } + 4 t + 3 \right) \mathbf { i } - 3 t ^ { 3 } \mathbf { j } + \left( 8 - t ^ { 2 } \right) \mathbf { k }$

• A) v(3) = 46i + 81j + 6k
• B) v(3) = 25i - 27j - 3k
• C) v(3) = 46i - 81j - 6k
• D) v(3) = 38i - 81j - 6k

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