A block slides down a 18° incline. The coefficient of kinetic friction between the block and the incline is 0.22. What is the magnitude of the block's acceleration?

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A: ⁰

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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!