Jovember 2010 P Р QUESTION 4 (Start on a new page.) A bullet moves east at a velocity of 480 m- st hits a wooden block that is fixed to the floor. The bullet takes 0.01 s to move through the stationary block and emerges from the block at a velocity of 80 ms east. See the diagram below. Ignore the effects of air resistance. Consider the block-bullet system as an isolated system. 480 ms 80 m.si w Fixed wooden block Explain what is meant by an isolated system as used in Physics. The magnitude of the momentum of the bullet before it enters the block is 24 kg m s. 4.2 Calculate the 42.1 Mass of the bullet (3) 4.22 Average net force exerted by the wooden block on the bullet
