A. 6.0 x 10‾²J
B. 7.6 x 10‾²J
C. 1.8 x 10‾²J
D. 6.6 x 10‾²J
Correct Answer:
Option A = 6.0 x 10‾²J
Explanation
Work done on a stretched cord
= Average force x extension
= (10 + 0)/2 x 1.2 x 10‾²
= 6.0 x 10‾²J
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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]")