A 45 lb block on a level frictionless surface is attached by a passing cord over a small frictionless pulley to a hanging block originally at rest 5ft above the floor. The hanging block strikes the floor in 1 second.  Find the weight of the hanging block  Find the tension in the string while the block are in motion

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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!