Question on: WAEC Physics - 2009
A machine of efficiency 80% is used to lift a box. If the effort applied by the machine is twice the weight of the box. Calculate the velocity ratio of the machine
A
0.50
B
0.63
C
0.80
D
1.60
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Correct Option: B
Y = (\frac{M.A}{V.R} \times \frac{100}{1})
= (\frac{\frac{1}{2}}{V.R} \times \frac{100}{1})
V.R = 0.625
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