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Starting from rest, a dog lunges after a ball and catches it 3.0 seconds later 18 meters north and 9.0 meters east from where he started. What are the north and east components of the dog's average acceleration?
$6.0\space m/s^2$ north$3.0\space m/s ^2$ east
$4.0\space m/s ^2$ north$2.0\space m/s ^2$ east
$2.0\space m/s ^2$ north$4.0\space m/s ^2$ east
$3.0\space m/s ^2$ north$6.0\space m/s ^2$ east