A combination of two lens having power +4.25 and -2.25 is used an object is placed 10cm away calculate image distance and nature

(b)!Let the object distance be x. The image distance must be x + 5 as the image distance must be larger due to nature of the concave mirror.!! The magnification is negative since a concave mirror produces inverted images

Explanation:

50 inches should be the resultant vector

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