Plz i wanna those solutions

because pressure is inversly proportional to the area of the object, i.e if area decreases pressure increases and vice-versa and area is less in sharp knife than in blunt knife hence sharp knives create great pressure than blunt knife.

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