If a fly bumps into the windshield of a fast-moving truck, (a) Which encounters the greater force: the fly or the truck, or is the same force encountered by both? (b) Which encounters the greater acceleration: the fly or the truck, or is the same acceleration encountered by both?

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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!