Two identical bodies have a velocity ratio 2 : 3. What is the ratio of kinetic energies?
Correct answer: C. 4:9
- A. 9:4
- B. 3:2
- C. 4:9
- D. 2:3
Explanation
Formula for kinetic energy is given as ½ mv2. As the masses are the same so, the kinetic energy will be in the ratios of the square of their velocities.
This question appeared on the NUMS 2020 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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