[单选题]
A 10.0-g bullet movicfihiz9)0z,:ony o 2un-p/y59d aknho g at 300 m/s is fired into a 1.00-kg block at rest. The bullet emerges (the bullet does not get embedded in the block) with half of its origih-n/ok yd 5p9anal speed. What is the velocity of the block right after the collision?