A small car collides head on with a large truck. Is the magnitude of the force exerted by the car on the truck greater than, less than, or equal to the magnitude of the force exerted by the truck on the car?

Equal

Explanation:

When a small car collides with a large truck then both car and truck will experience same amount of force in magnitude. The direction of force will be opposite but magnitude will be same. This is the third law of Newton's say that every action have it reaction but in the opposite direction.

But the acceleration of both the bodies will be different. Small car acceleration will be more as compare to the large truck.