Arubber bullet of mass m is fired from a rifle into a stationary block of 25 m. the bullet remains in the block and both the bullet and the block move off with a common velocity. assume this is an inelastic collision in a closed system. which best describes the final momentum of the bullet/block? the final momentum of the bullet/block is zero. the final momentum of the bullet/block is equal to the initial momentum of the bullet. the final momentum of the bullet/block is less than the initial momentum of the bullet. the final momentum of the bullet/block is more than the initial momentum of the bullet.