You can tell whether velocity is changing because velocity is the rate/speed of motion of something in a direction either it increase or decrease in the speed or a change in its direction that will causes its velocity to change.
Precipitation in a cold front typically occurs around the outer edges of the cooler air mass. This is where the cool air meets the previously warm air.
Also, it can be said to happen at the front of the front and behind the front.
Answer: The control group is the part where you see what happens when you change a variable you want to study/examine. Basically, you need the control group because you need something to see what happens when you change something.
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Answer: option 3 Ta < Tb = Tc < Td
Explanation:
Ta = mv²/r = mv²/r
Tb = m(2v)²/2r = (m)4v²/2r = 2mv²/r
Tc = (2m)v²/r = 2mv²/r
Td = (2m)(2v)²/r = (2m)4v²/r = 8mv²/r