A tractor trailer truck and a car are traveling at exactly the same speed and both drivers apply equal braking force at exactly the same moment Does the truck have greater inertia or less inertia?

All you need to know to answer this question is whether the truck is heavier than the car. Assuming this is true, yes, the truck does have a greater inertia. Inertia is related directly to mass, so because m_truck > m_car, inertia_truck > inertia_car. Generally, inertia refers to the ability to change the velocity of an object.