Which of the following bodies has the largest kinetic energy?
Correct answer: B. Mass 2M and speed 3v
- A. Mass 3M and speed v
- B. Mass 2M and speed 3v
- C. Mass 3M and speed 2v
- D. Mass M and speed 4V
Explanation
K.E = 1/2Mv2The K.E will be maximum when the product of "M" and "v²" is maximum. In (B) the product has maximum value i.e. 9Mv².
This question appeared on the KMU MDCAT 2023 paper, which you can sit online with every answer explained.
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About Kinetic Energy
Kinetic energy is the energy of motion, given for a nonrelativistic object by K = ½mv², so it depends on mass and the square of speed. Questions connect kinetic energy with work through the work energy theorem, calculate changes in kinetic energy, and distinguish it from momentum and potential energy.
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