Three Decimal Places

Multiple Choice

$\text { Find } a _ { \mathrm { N } } \text { at time } t = 1 \text { for the plane curve } r ( t ) = 9 t ^ { 2 } \mathbf { i } + 5 t \mathbf { j } \text {. Round your answer to }$ three decimal places.

A) 6.581
B) 4.818
C) 3.407
D) 2.154
E) 4.962