1. A rock dropped off a small cliff. After 9 seconds, it hits the ground. Find the rock's instantaneous velocity after seconds. What is the rock's velocity at impact? How high is the cliff? 2. A cowboy punter kicks a football straight up into the air. The football has an initial velocity of 2 m/s. How high does the football go? How long is the football in the air?

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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!