The earth's orbit around the sun is very nearly circular, with an average radius of 1.5 x 10 m. Assume the mass of the earth is 6 x 1024 kg. What is the average speed of the earth in its orbit around the sun? (Remember that you already know the period. You just need to convert the period into seconds.)

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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!