A .22 rifle bullet, traveling at 350 m/s, strikes a block of soft wood, which it penetrates to a depth of 0.130m. The block of wood is clamped in place and doesn't move. The mass of the bullet is 1.80g. Assume a constant retarding force. How much time is required for the bullet to stop? What force, in Newton's, does the wood exert on the bullet?