1. Taking a frame attached to Earth as inertial, which of the following objects cannot have inertial frames attached to them, and which are inertial reference frames? a. A car moving at constant velocity b. A car that is accelerating c. An elevator in free fall d. A space capsule orbiting Earth e. An elevator descending uniformly

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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!