1. We know that we need 5000N to drive a nail 2.5 cm into a wall. How fast does a hammer of 500g mass have to be in order to drive the nail in the wall in one stroke?(look at the picture if it is unclear. The 2 cm in the picture should be 2.5cm) 2. F=m*a W=F*x x=distance 3. I thought it would simply be 10m/s since 5000N=10m/s*500g. But my teacher said it is wrong. Now I have to get to the solution which is 19m/s and show him how I did it.