A machine has an efficiency of 60%. If the machine is required to overcome a load of 30 N with a force of 20 N. Calculate its mechanical advantage? By: Sunday|Published on: Aug 29|Categories: Physics WAEC| 0 comments A. 0.7 B. 0.9 C. 1.5 D. 2.5 E. 10.0 Correct Answer: Option C – 1.5 Users Also Read These:A machine whose efficiency is 60% has a velocity ratio of 5.…The diagram above illustrates a block and tackle pulley…The efficiency of a wheel and axle is 100% and the ratio of…A machine of efficiency 80% is used to lift a box. If the…What effort will a machine of efficiency 90% apply to a load…SEE ALSO The following devices use plane mirrors in their operations, except?