A body of mass 1.0 kg drops from the top of a tower of height 50 m. What will be its K.E. 10 m below the top?
Correct answer: B. 98 J
- A. 490 J
- B. 98 J
- C. 49 J
- D. 980 J
Explanation
Gain in K.E = Loss in Gravitational P.EK.E= mg(h1 - h2)= (1)(9.8)(50 - 40) = 9.8(10) = 98 J
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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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