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While driving down the road, if you hit the brakes suddenly, your body moves forward. Explain the reason for this.

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Hi user1530249 - it helps if you ask your question as a question, not as a statement. Also, this is explained on many websites about motion. What other explanations did you look at, and what did you have trouble understanding about them? – David Z Feb 14 '13 at 4:03

While your driving a car, you share a reference frame with it, meaning your velocities and accelerations are approximately equal. When you hit the breaks you no longer share a frame of reference as the car is decelerating with respect to the road. However your still moving forward until acted on by an external force i.e. your seatbelt.

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