1. What is your average speed if:
   1. you travel at 20 meters per second for 2 minutes, and at 15 meters per second for 2 minutes?
   2. you travel at 20 meters per second for 2 minutes, and at 15 meters per second for 5 minutes?
2. Suppose that the equation $x(t ...

Acceleration changes velocity, but where does acceleration come from?

Velocity changes position, acceleration changes velocity