When total work done on a particle is positive then_.
Correct answer: B. Momentum increases
- A. KE remain constant
- B. Momentum increases
- C. KE decreases
- D. All of these
Explanation
If work done is positive then kinetic energy increases. Since kinetic energy is directly proportional to the momentum therefore momentum also increases.
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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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