In an elastic collision, both the momentum and the kinetic energy of the system are conserved. Identify which scenario describes an elastic collision. A) A bullet is shot into a wooden block and becomes embedded (stuck)in the block

B)A girtjumps off the dock into a boat. The boat and the girl begin to move

C)Two billiards balls strike each other and bounce off moving in different directions

D)A female ice skater skates to her partner and he lifts her up. They continue to move as he holds her over his head.

The answer is c. Two billiards balls strike each other and bounce off moving in different directions

Hope this helps

Entropy is defined as the increase in disorder in a system. This occurs in the food chain because as animals eat food, they supply less energy to the next level of the food chain. What does this mean? Think of a rabbit. The rabbit eats almost all day, everyday. The energy in the grass is in an ordered state but becomes disordered as it goes though the rabbit. This is because the rabbit does things like cellular respiration, and gives off heat (this is wasted energy -- disorder). So out of the total amount of energy that flows through the rabbit only about 10% of this energy goes on to a fox that eats a rabbit due to all of this wasted energy. Cheers!