What size did the Alvarez team calculate for the asteroid whose impact on Earth led to the extinction of the dinosaurs

the answer is a. hope this .

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

because if the tool that you are using is not balanced it there would be false mass.