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? by Sunday | May 19 | Physics WAEC | 0 comments A. 0.50 B. 0.63 C. 0.80 D. 1.60 Correct Answer: Option B B. 0.63 Users Also Read These:A 500N box rests on a horizontal floor. A constant…A wheel and an axle is used to raise a load whose…A machine whose efficiency is 60% has a velocity…A boy pushes a 500kg box along a floor with a force…The efficiency of a wheel and axle is 100% and the…