A person is falling from a certain height. Which of the following is likely to happen?   if he falls on a concrete floor, he gets more injuries   he is unaffected   he gets the same injuries in both cases   if he falls on a heap of sand, he receives less injuries

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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!