A 1 kg ball changes its velocity from 6 m/s to 2 m/s. What are the changes in the kinetic energy of the ball?
Correct answer: D. 16 J
- A. 2 J
- B. 4 J
- C. 8 J
- D. 16 J
Explanation
K.E = 1/2 m Δv2 = 1/2 m (Vf2 - Vi2)K.E = 1/2 x 1 x (22 - 62)K.E = 0.5 x (-32) = -16JNeglect the negative sign. Hence, the change in kinetic energy is 16 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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