A body of mass 'm' is moving with velocity 'v'. After a short interval of time its velocity becomes double. How many times its K.E will increase or decrease?
Correct answer: D. 4 time increased
- A. 2 time increased
- B. 2 time decreased
- C. 4 time decreased
- D. 4 time increased
Explanation
Kinetic energy is proportional to the square of velocity, so if velocity doubles, K.E increases 4 times.
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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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