To calculate the net force of the system, you can use the following approach:
- Assign the downward force (100 N) a negative value, so it is -100 N.
- The upward force from the spring is positive, so it is +150 N.
Now, find the net force by adding these two forces together:
\[ \text{Net Force} = \text{Upward Force} + \text{Downward Force} = 150 N + (-100 N) = 150 N - 100 N = 50 N \]
Thus, the net force of the system is 50 N.