The greater impact force (in magnitude) acts on a) the car
Since , both the objects that is the car and a massive truck is coming and colliding with a certain speed , which means they are acquiring some momentum because of mass and speed , since they are coming with certain momentum when collided must have impacted each other.
Momentum is the measure of product of mass and velocity , if both of them are coming with same velocity then total dependency of impact will be on their masses , since truck is massive and car is small sports car , that means truck must have greater mass than the car , hence the greater impact force act on a) the car
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