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 | Aug 29 | 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 of efficiency 80% is used to lift a box.…A block and tackle system has six pulleys. a force…What effort will a machine of efficiency 90% apply…A machine of velocity ratio 5 is used in lifting a…A machine whose efficiency is 60% has a velocity…