Why do passengers in a vehicle move backward when the vehicle suddenly moves forward? By the law of inertia, the passengers tend to retain their state of being at rest. Since the passengers are seated on a jeepney, the friction on their seats pulls them forward, making them look like they're moving backward. Both a and b.

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!