The positions of objects A and B are graphed in the following figure. Answer the following questions and explain. a. Is the acceleration of object A positive, negative, or zero at t=2sec? b. At t=2sec, is object B speeding up, slowing down, or moving with constant speed? c. Is the acceleration of object B positive, negative, or zero at t=2sec? d. Which object has the greater speed 200 100 -100 at t=11sec? B e. Find the average velocity of object B -200 for the 20 second interval shown. 10 12 14 16 18 20 Position (m) 4.

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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!