heila and Kevin are helping thelr science teacher design a lab exercise about gravity in the universe. The simple set-up requires the use of two softballs. Ball 1 has nothing attached to it. Ball 2 has a long string connected to it. The first step of the activity is to throw Ball 1 in a straight line down the hallway to model a planet that is not affected by the Sun's gravity. What should be done in Step 2 to model the Sun's effect on a planet? A. The ball is thrown around the body while holding on to the string. B. The ball is thrown around the body with the string trailing behind C. The ball is thrown in a straight line while holding the string. D. The ball is thrown in a straight line with the string trailing behind.

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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!