An astronaut standing on the surface of Ceres, the large asteroid, drops his cell phone from a height of 10 m and it takes him 8.06 s to reach the ground. A. Calculate the acceleration of gravity on Ceres (Note: Solve as problem free fall) B. Find the mass of Ceres if its radius is Rc = 5.1x102 km Free Body Diagram of Exercise Balance of forces in both axes Operations Results

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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!