Understanding the Forces

* Weight (Force of Gravity): The barrel's weight is 1000 N, acting downwards.

* Drag Force: The air resistance acting upwards, opposing the motion, is 400 N.

Calculating Net Force

The net force is the vector sum of all forces acting on the object. Since the forces are in opposite directions:

* Net Force = Weight - Drag Force

* Net Force = 1000 N - 400 N

* Net Force = 600 N

Conclusion

The net force on the barrel is 600 N downwards. This means the barrel will continue to accelerate downwards due to the unbalanced force.