Two forces, of magnitude 4N4N and 10N10N, are applied to an object. The relative direction of the forces is unknown. The net force acting on the object . Check all that apply.

Only option A is correct.

The net force acting on the body cannot have a magnitude equal to 5N.

Explanation:

There is literally a wide range of directions that the two force could be facing. That is, the angle between the line of action of the two forces can literally range from 0° to 180°. With the net force between them ranging from when the angle between the two forces is 180° and they point to the opposite directions with resultant equal to (10 - 4 = 6N) to when the angle between the two forces is ° and they point in the same direction and the resultant between them has a maximum magnitude of (10+4 = 14 N)

One of the forces might also act in a direction where it won't effect the resultant and the resultant is either one of the two forces. Hence it can take on values of 10 N and 4 N

So, option B isn't correct as the resultant can take on the value of 10 N.

Option C isn't correct either as the resultant would most likely than not end up in the same direction as the 10 N force.

Then, the last option isnt correct too, as the magnitude of the resultant can be lower than 10 (like I pointed out when the forces are acting in opposite directions)

Only option A is correct as all through the ranges possible, there's no way one of the many options ends up with a resultant of magnitude 5N.

the old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form