Velocity versus time graph of a ball of mass 50g rolling on a concrete floor is shown above. Calculate the acceleration and the frictional force of the floor on the ball? 100 80 60 + 40 + 20 4 6. 10 Time (s) Velocity (ms¬1)

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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!