The magnitude of inertia depends on the mass of the body.
What is inertia?
The term inertia has to do with the degree of resistance to motion. We know that an object will continue in its state of rest or uniform motion unless it is acted upon by an external force.
The magnitude of inertia depends on the mass of the body. Since the truck is more massive than the car, it follows that a moving truck takes a much longer time to stop than that taken by a car when brakes are pressed at the same time.
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