Someone holds the block on the table at rest. Once he releases the block, the block may accelerate or not. In either case, calculate the acceleration in m/s². These are the numbers: • m = 0.4 kg • M = 0.2 kg . μs-0.4 . μk -0.2 m 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!