If a small machine does 2,500 joules of work on an object to move it a distance of 100 meters in 10 seconds,
what is the force needed to do the work? what is the power of the machine doing the work?

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.