A machine is used to lift a load of 20 N through a height of
PHYSICS
JAMB 2011
A machine is used to lift a load of 20 N through a height of 10 m. if the efficiency of the machine is 40%, how much work is done?
- A) 80 J
- B) 500 J
- C) 300 J
- D) 120 J
Correct Answer: B) 500 J
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