1. The problem statement, all variables and given/known data I don't know how to use this forum so here we go. My 16 year old autisitc son is stumped with this question. If anyone can help me send him in the right direction it would be great, I am lost. dog with a mass of 113 g runs to the right at 2.00 m/s, sees a mouse stopes using paws, slides 80.0 cm during deceleration, dog turns and runs other direction, calculate the magnitudes of change in dog's momentum AND the average frictional force that brings about this change. He can't figure out what formula to use and I have no idea, can anyone point me in the right direction? what happened to 2+2=4? 2. Relevant equations 3. The attempt at a solution total 1^p=0 slow down segment = 0.226ns run in opposite direction segment = 0.226ns help?