A woodpecker exerts a 230-N force on a tree trunk during its effort to find hidden insects

Question:

A woodpecker exerts a 230-N force on a tree trunk during its effort to find hidden insects to eat. If its head has an effective mass of 0.025 kg, what is the acceleration of its head away from the tree trunk? The woodpecker's skull has a special spongy bone plate to protect itself against brain concussions.