For the 2500-lb car, determine (a) its mass in slugs, (b) its weight in newtons, and (c) its mass in kilograms. Answers: (a) m- (b) W- (c) m- W = 2500 lb slugs N kg

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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!