What is kinetic energy of body 5kg and momentum 15 kgm/sec?
Correct answer: D. 22.5J
- A. 30J
- B. 55J
- C. 50J
- D. 22.5J
Explanation
Correct Option:DThis option is correct because we know from the formula of kinetic energyK.E=1/2mv²...(1)From the formula of momentum, we knowSo P²=m²V²=P²/m²Putting the value in equation 1K.E=mp²/2m² Cancelling m with one min denominator we get KE = p²/2mPutting the given data K.E=(15 kg m/s)/10KE= 225 joule
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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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