Final answer:
When a customer slides an empty beer mug down the bar counter, the mug moves and stops somewhere in between.
Step-by-step explanation:
The subject of this question is Physics. The question is asking what happens when a customer slides an empty beer mug down the bar counter. The customer is applying force to the mug, causing it to move. The answer is C) The mug moves and stops somewhere in between. When the mug is sliding, it will experience friction with the counter, which will cause it to slow down and eventually come to a stop.