1. The problem statement, all variables and given/known data A 5lb hammerhead, traveling at 5.4ft/s strikes a nail and is brought to a stop in .00081s. The acceleration of gravity is 32ft/s^2, What force did the nail recieve? 2. Relevant equations The equation I have is F=Pf-Pi/delta T. Both Pf and Pi have a arrow above them going to the right. 3. The attempt at a solution I know I have to find Pf and Pi, and P=mv. With that said would Pf be 0, since it comes to a stop, and Pi be (5lb)(5.4ft/s)? And I am guessing that delta T would .00081s?