The apparatus in the video contains a blue track, yellow track, green track, and red track. If four metal spheres are released from the top of each ramp at the same time, which ramp do
you think will produce the greatest speed in the marble by the time it reaches the bottom?
Why do you think this ramp will produce the greatest speed in the marble?

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.