From last lab, we know that how high up an object is determines how long it takes it to fall. The equation for this is h = 1/2 g t^2. If you rearranged this equation to solve for t, what would you get? * pick whcih answer is best  t=1/2sqrt(hg)       t = sqrt(2hg)       t=sqrt(2g/h)       t = sqrt(2h/g)   sqrt means square root

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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!