What happens on the force of gravity exerted by the earth to a rocket propelling away from it? a. The force decreases inversely proportional to r b. The force decreases inversely proportional to r^2 c. The force increases directly proportional to r d. The force increases directly proportional to r^2

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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!