A body of mass 1 kg has kinetic energy 50 J. Its speed is
Correct answer: B. 10 m per second
- A. 5 m per second
- B. 10 m per second
- C. 50 m per second
- D. 100 m per second
Explanation
From half mv squared equal to 50, v squared is 100 and v is 10 m per second. Forgetting the factor of one half gives about 7.1, and forgetting to take the square root gives 100. Checking the units at the end is a quick guard against both slips.
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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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