The long pendulum shown is drawn aside until the ball has risen 0.50 m. It is then given an initial speed of 3.0 m/s. The speed of the ball at its lowest position is:
Correct answer: D. 4.3 m/s
- A. Zero
- B. 0.89 m/s
- C. 3.1 m/s
- D. 4.3 m/s
Explanation
In this kind of questions, we need to apply the principle of CONSERVATION OF MECHANICAL ENERGY. The net change in potential energy will be equal to the change in kinetic energy. Let velocity at lowest point be v , initial velocity be u:
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About Work and Energy
Work transfers energy when a force causes displacement, while kinetic energy, gravitational potential energy and power describe motion, position and the rate of energy transfer. The work-energy theorem links net work with change in kinetic energy, and efficiency accounts for energy losses rather than treating them as energy destruction.
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