If a stone of mass 500g is dropped from height 20m then kinetic energy while hitting the ground is :
Correct answer: D. 100 J
- A. 10 J
- B. 40 J
- C. 75 J
- D. 100 J
Explanation
As the potential energy of an object at the highest point converts into KE while going downhence, KE=mgh 500g=0.5kg =0.5*10*20 =100
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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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