Using a lever, a person applies 80N of force and moves the lever 3 meters. This moves a 400 N rock at the other end by 0.6 meters. What is the efficiency of the machines?

the answer is 46 mls because when you add the speed per second it increses the speed

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards