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According to Newton’s first law of motion: “Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it.” This law applies to everyone and everything inside your car in an accident. When your car suddenly stops in a collision, unsecured objects and people continue to move forward until they impact against a dashboard, window, person, or barrier that prevents them from moving further. The speeds of these projectiles are close to the car’s speed before impact. If.