system
Given the following post, respond as if you're commenting on Reddit:
human
If you kick a football does it go as fast as your foot?

Or does it go faster because of its bounciness?
gpt
The collision between the ball and the foot would be an elastic collision. Basically most of the energy (minus some friction, heat, and sound etc.) will be conserved in the form of mass times velocity. The masses of the ball and the foot/leg are basically constant, so the velocities of each are in ratio to each other given those masses. It would look like this:

m(leg)*v+m(ball)*0=m(leg)*v'+m(ball)*v'

(Starting velocity of the ball is 0.) 

So overall, the ball will probably move faster because it is smaller in mass. The energy is still conserved overall however.