A. 80 J
B. 500 J
C. 300 J
D. 120 J
Correct Answer:
Option B – 500 J
Explanation
Efficiency = work output/work input×100
= 40 = (20×10)/ x 100
= 500J
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![A load of mass 120kg is raised vertically through a height of 2m in 30s by a machine whose efficiency is 100%. Calculate the power generated by the machine. [g = 10ms‾²]](https://erudites.ng/wp-content/plugins/contextual-related-posts/default.png "A load of mass 120kg is raised vertically through a height of 2m in 30s by a machine whose efficiency is 100%. Calculate the power generated by the machine. [g = 10ms‾²]")
