A 0.001 kg bullet is fired from a gun and lodges inside a wooden block of mass 0.2 kg. The block and bullet then slide on a rough floor with a coefficient of kinetic friction μk = 0.4 before coming to rest after sliding a distance of 3 m.
Compare KE_initial, the initial kinetic energy of the bullet, with W_friction, the macroscopic work done by the frictional force between the block and the floor in stopping the block.
Not sure on this but, is KEi greater than W_friction because it is positive while w_friction is negative?
The initial velocity of the bullet was:
And this is the question I'm most stuck on. Thanks!