Answer the following question given this paragraph: 

rest after sticking together, conserving momentum. But the internal kinetic energy is zero after the collision. A collision in which the objects stick together is sometimes called a perfectly inelastic collision because it reduces internal kinetic energy more than does any other type of inelastic collision. In fact, such a collision reduces internal kinetic energy to the minimum it can have while still conserving momentum. Perfectly Inelastic Collision A collision in which the objects stick together is sometimes called “perfectly inelastic.


Q: A perfectly inelastic collision reduces internal kinetic energy to the minimum it can have while still conserving what?


A:
momentum