Correct Answer: Option C

Explanation

Efficiency = \(\frac{\text{M.A}}{\text{V.R}}\)
75% = \(\frac{\text{M.A}}{\text{V.R}}\)
\(\frac{75}{100} = \frac{\text{M.A}}{5}\)
M.A = \(\frac{75(5)}{100}\) = 3.75

But M.A = \(\frac{\text{Load}}{\text{Effort}}\)
3.75 = \(\frac{150}{\text{Effort}}\)
Effort = \(\frac{150}{3.75}\)
Effort = 40N

There is an explanation video available below.

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