which one best describes appr. uniform velocity?

Question

1. a hockey puck sldng across the ice
2. a baseball pitched toward a batter
3. the tip of the minute hand on a clock
4. an olympic sprinter running the 100m

Answer 1

The answer is 3 but you need to know why! (Think about things like friction, wind, etc. which are forms of resistance and how fast a minute hand moves around the clock...does it ever change speed?)