In the presence of air friction, the relation for free falling body is
Correct answer: C. mgh = 1/2 mv2 + fh
- A. mgh = 1/2 mv2 - fh
- B. mgh = fh - 1/2 mv2
- C. mgh = 1/2 mv2 + fh
- D. mgh = fg +1/2 mv2
Explanation
mgh = 1/2 mv2 + fh (In the presence of friction)
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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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