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Earlier discussion
2 older comments kept for context.
Favour Onwuchekwa
Efficiency[E] =90%
Load[L]= 180N
Effort = e
Mechanical Advantage[M.A]=
\( \frac{Load}{Effort} \)
Velocity Ratio[V. R]= 2
Recall;
Efficiency= \( \frac{M. A}{V. R}×100 \)
90% = \( \frac{180}{e}× \frac{1}{2} ×\frac{100}{1} \)
90% = \( \frac{18000}{2e} \)
2e = \( \frac{18000}{90} \)
2e = 200
e = 100N
option [A] is 100% correct.
Peter Victor
Why is vr 2