1. The problem statement, all variables and given/known data The speed of the head of a redheaded woodpecker reaches 3.7 m/s before impact with the tree. The mass of the head is 0.060 kg and the average force on the head during impact is 6.1 N. (a) Find the acceleration of the head (assuming constant acceleration). km/s2 (b) Find the depth of penetration into the tree. cm (c) Find the time it takes for the head to come to a stop. 2. Relevant equations F=ma F=mv^2/2d 3. The attempt at a solution For a I tried to used the formula F=ma and divided the force by the mass to find the acceleration or 6.1/0.060 but this did not work. I got the answer for b by using F=mv^2/2d and got 6.7cm which was correct. In order to get the answer for c I think I need the answer for a.