The distance-time graph below represents the position of an object moving in a straight line. What is the speed of the speed of the object during the time interval= 2.0 seconds to t = 4.0 seconds

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.