To calculate the net force, you assign values to the forces based on their directions. In this case, you have:
- Force of the cue ball moving to the left: +70 N (positive because we assigned left as positive)
- Force of the four ball moving to the right: -50 N (negative because we assigned right as negative)
Now, you can calculate the net force:
Net Force = (Force of cue ball) + (Force of four ball)
Net Force = 70 N + (-50 N)
Net Force = 70 N - 50 N
Net Force = 20 N
So, the net force of this system is 20 N.