Answer: 3250 N in the opposite direction
Step-by-step explanation:
According to Newton's third law of motion:
"Each action has an equal and opposite reaction"
To understand it better:
When two bodies interact between them, appear equal forces and opposite senses in each of them. For example, if a body A exerts a force on another body B, it performs on A another force with the same magnitude and in the opposite direction.
Hence, this law states that for each force acting on a body, ther is a force of equal intensity but in the opposite direction on the body that produced it.
In this sense if the car hit the concrete barrier with a force of 3250 N, the concrete barrier will exert a force of -3250 N on the car (where the negative sign indicates the force is acting in the opposite direction).