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A machine has a velocity ratio of 5. It requires a 50kg weight to overcome...

Physics
JAMB 1983
A machine has a velocity ratio of 5. It requires a 50kg weight to overcome a 200kg weight. The efficiency is
  • A. 4%
  • B. 5%
  • C. 40%
  • D. 50%
  • E. 80%
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Correct Answer: Option E
Explanation
Efficiency = M.A x 100%

= \(\frac{200}{50}\) x \(\frac{1}{5}\) x 100

= 80%
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