A cylinder of mass 30kg and radius 2 meters is rolling on a table without sliding. If velocity is 4 meters per second then calculate its kinetic energy.
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The reason the two previous answers are a little different is the vocabulary.
Kinetic energy can be used to refer to just the m∗v2/2 or to the kinetic energy of all the moving particles. That energy can also include the kinetic energy of the thermal motions as well.
The resolution is the pact that you’ve formed with the person who is writing the question.
You need to determine which “energy” the “kinetic energy” refers to.
This is not an uncommon problem in science . . . what exactly do the words refer to? Not everyone uses them the same way.
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