A 1200 kg car travelling at 50 km/h experiences an air resistance of 5000 N and road friction of 7500 N.   A) What is the car’s speed in m/s?   B) If the wheels push forward with a force of 17500 N, what is the car’s acceleration?     C) What is the car’s speed, in km/h, if the acceleration was maintained over a distance of 1000 m?

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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!