According to Newton’s second law: a. The velocity of a particle is equal to the net force on the particle divided by the mass of the particle. b. The net force on a particle is equal to the product of the velocity of the particle with the acceleration of a particle. c. The net force on a particle is equal to the product of the mass of the particle with the acceleration of a particle.

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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!