You are driving in your car and you apply a constant force to your brake pedal. Which of the following are changing? (Ignore air resistance) a) Speed b) Velocity c) Acceleration d) Speed and Velocity e) All of the above

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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!