A heavy truck and a small car rolling down a hill at the same speed are forced to stop in the same amount of time.Compared to the force that stops the car,the force needed to stop the truck is

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According to Newton's second law of motion, F=ma (force equals mass times acceleration). The truck has a greater mass than the car, which means that its acceleration will be smaller when both vehicles are forced to stop in the same amount of time. Therefore, the force needed to stop the truck will be greater than the force needed to stop the car.

A Heavy Truck and a Small Car Rolling Down a Hill