A 100 gram bullet is fired into a 300 gram block of wood. It sticks inside the wood and, after the collision, the block is moving at 2 m/s. Which statement is correct about the kinetic energy of the collision and correctly identifies the original speed of the bullet?
a
The kinetic energy increases and the bullet was moving at 8 m/s.
b
The kinetic energy decreases and the bullet was moving at 8 m/s.
c
The kinetic energy increases and the bullet was moving at 6 m/s.
d
The kinetic energy decreases and the bullet was moving at 6 m/s.
