Answer to Three Decimal Places

Multiple Choice

$\text { Find } a _ { \mathbf { T } } \text { at time } t = 2 \text { for the space curve } \mathbf { r } ( t ) = ( 6 t - 7 ) \mathbf { i } + t ^ { 2 } \mathbf { j } - 10 t \mathbf { k } \text {. Round your }$ answer to three decimal places.

A) 0.781
B) 0.724
C) 0.343
D) 0.686
E) 0.649