What is the net force on a bag pulled down by gravity with a force of 18 newtons and pulled upward by a rope with a force of 18 newtons?

0 N.

Explanation:

Force: This can be defined as the product of mass and the acceleration of the body. The S. I unit of force is Newton (N).

The expression of net force when both force act in the different direction is given as

F' = W-F ... Equation 1

Where F' = Net force on the bag, W = gravitational force on the bag, F = Force acting upward on the bag

Given: W = 18 N, F = 18 N.

Substitute into equation 1

F' = 18-18

F' = 0 N.

Hence the net force = 0 N.