A student performs an experiment to determine the density of an unknown metal cylinder, density of cork, and the specific gravity of kerosene. The student weighs the metal cylinder in air and records it to be 0.98 N. When the cylinder is completely submerged in water it weighs 0.823 N and weighs 0.854 N when completely submerged in kerosene.

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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!