Which of the following statements is correct?

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Forces applied to an object in the same direction are multiplied by each other.

Forces applied to an object in the opposite direction are added to one another.

Forces applied to an object in the same direction are added to one another.

Forces applied to an object in the same direction are subtracted from one another.

answer is C.

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Detailed Solution

The net force on an object is the total force acting on an object.
Forces applied on an object in the same direction are added to one another whereas the forces exerted in the opposite direction are subtracted from each other.
For example, in the following image, 40 N and 8 N are acting in the same direction therefore, they will be added to each other. Therefore, the force exerted from the left side will be 40 + 8 = 48 N.
Since the force exerted from the right side is opposite to the force exerted from the left side, they will be subtracted from one another. Therefore, the net force will be 48 - 32= 16 N.