A certain machine is used to lift a load of 250 N. when an effort of 50N is applied to the machine , the load is raised by 1m and the effort is moved by 6m . please please calculate the efficency. I will follow you.​

Which statement best describes the superposition principle? a.) if two in-phase waves arrive simultaneously at a point, their amplitudes add up b.) if two out-of-phase waves arrive simultaneously at a point, their amplitudes add up c.) if two in-phase waves arrive at a point one after another, their amplitudes add up d.) if two out-of-phase waves arrive at a point one after another, their amplitudes adds up