Fact 1: Friction causes the speed of an object to decrease.

Fact 2: And whenever there is friction, energy is lost.

Given the two facts above, answer the question "What is lost as the speed of an object decreases?" with the following options: 
- cartilage
 - density
 - alveoli
 - light
 - energy
 - smell
 - sunlight
 - mass


 

     energy    