Which of the following condition will be true for a planet to have atmosphere? [A] velocity of molecules in its atmosphere is lesser than escape velocity [B] velocity of molecules in its atmosphere is greater than escape velocity [C] velocity of molecules in its atmosphere is twice the escape velocity [D] velocity of molecules in its atmosphere is equal to the escape velocity

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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!