A stone of mass 1 kg is dropped from a height of 10 m with the speed of 14 m/s. The approximate kinetic energy is:
Correct answer: C. 200 J
- A. 10 J
- B. 0 J
- C. 200 J
- D. 1000 J
Explanation
m=1kg h=10m v=14m/sK.Ef = K.Ei + loss in GP.EK.Ef = 1/2mv2 + m.g.hK.Ef = ½ (1)(14)2 + (1)(10)(10)K.Ef = (0.5)(196) + 100K.Ef = 198JApproximately equals to 200J.Hence,C is the correct option.
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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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