To find the net force acting on the runner, we need to consider the running force and the air resistance force.
The runner exerts a force of 325 N to the right, and the air resistance force is 45 N to the left.
The net force can be calculated by subtracting the air resistance from the running force:
Net force = Running force - Air resistance Net force = 325 N (right) - 45 N (left) Net force = 325 N - 45 N = 280 N (to the right)
Therefore, the net force of the runner is 280 N.
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