A circular test track for cars has a circumference of 4.5km. A car travels around the track from the southernmost point to the northernmost point. -What distance does the car travel? (In km)

-What is the car's displacement from its original position? (In km)

Why is rain likely when warm, moisture-laden air meets cold air? a) the lighter warm air will rise and cool down, causing condensation and rain. b) the cold air moves faster and pushes the warm air away, causing condensation and rain. c) the moisture in the warm air condenses on contact with the cold air, causing rain to fall. d) the cold air mixes with the warm air, reducing its temperature causing moisture to condense.