posted by Anonymous .
A hammer with 10 J of kinetic energy hits a nail and pushes it 5.0 mm into a plank.
Both the hammer and nail come to rest after the collision.
What is the average force that acts on the nail while it moves the 5.0 mm?
F=ma=mv²/2s= 2m•KE/2s m=
= KE/s=10/0.005 =2000 N