Part A- The acceleration due to gravity is equal to zero at the center of the earth.(True or False) Part B- If you were to go to the international Space Station you would be weightless. Gravity on the space station is 92 % of that as compared to the surface of the earth. The reason you feel weightless is because you are falling around the earth.(True or False)

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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!