Final answer:
The net force exerted on the car by two people pushing westward with forces of 200 N and 250 N is 450 N westward.
Step-by-step explanation:
When two people are pushing on a broken-down car with forces in the same direction, you calculate the net force by simply adding the magnitudes of the two forces together. If one person exerts a force of 200 N to the west and the other exerts a force of 250 N to the west, the net force exerted on the car would be:
200 N (west) + 250 N (west) = 450 N (west).
Therefore, the net force exerted on the car is 450 N toward the west.