Cindy wrote the following phrase to describe the movement of particles in a state of matter. "Tennis balls are neutral particles, far away from each other and moving at fast speeds."

Which state of matter did Cindy most likely describe?
Gas
Plasma
Liquid
Solid

The drag force, fd, imposed by the surrounding air on a vehicle moving with velocity v is given by fd = cdaρv 2/2 where cd is a constant called the drag coefficient, a is the projected frontal area of the vehicle, and ρ is the air density. an automobile is moving at v = 80 kilometers per hour with cd = 0.28, a = 2.3 m2, and ρ = 1.2 kg/m3.