1. An object at rest is suddenly broken apart into two fragments by an explosion. One fragment…

1. An object at rest is suddenly broken
apart into two fragments by an explosion. One fragment acquires twice the
kinetic energy of the other. What is the ratio of their masses?

2. A 22 g bullet traveling 210 m/s
penetrates a 2.0-kg block of wood and emerges going 150 m/s. If the block is
stationary on a frictionless surface when hit, how fast does it move after the
bullet emerges?