If a certain force acts on an object and changes its kinetic energy from 65 J to 130 J, then work done by the force will be:
Correct answer: C. 65 J
- A. 92.5 J
- B. 97.5 J
- C. 65 J
- D. 130 J
Explanation
Explanation:Final Kinetic energy (K.Ef) = 130 JInitial Kinetic energy (K.Ei) = 65 JWorkdone = W = ?As we know that: W = K.Ef - K.Ei = 130 - 65 J W = 65 J
This question appeared on the UHS MDCAT 2009 paper, which you can sit online with every answer explained.
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About Work-Energy Theorem
The work-energy theorem states that the net work done on an object equals its change in kinetic energy. Questions involve positive and negative work, variable forces and force-displacement graphs, acceleration or deceleration, and the difference between this theorem and conservation of mechanical energy, which also requires attention to potential energy and non-conservative work.
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