A machine has a velocity ratio of 5. It requires a 50kg weight to overcome a 200kg weight. The efficiency is
A
4%
B
5%
C
40%
D
50%
E
80%
Verified Correct Answer: E.
Physical Principles & Numerical Solution
Efficiency = M.A x 100%
= \(\frac{200}{50}\) x \(\frac{1}{5}\) x 100
= 80%
Source: Myschool Past Questions Archive (Record #28868)