JAMB Physics 2023 Objective — Question 20
Question 20 of 40 from the Joint Admissions and Matriculation Board (JAMB) Physics 2023 Objective paper, with the correct answer and a full explanation.
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A machine lifts 20 N load through 10 m. Efficiency 40%. Work input:
- A. 80 J
- B. 800 J
- C. 500 JCorrect
- D. 50 J
Explanation
Output=200 J; input=200/0.4=500 J.
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