An elevator is moving upward at a constant speed, pulled by the cable it is attached to. What forces are acting on the elevator?  The weight, the force of gravity, and the tension  The weight and the tension force  The weight, the normal force, and the tension force  The weight and the normal force  Only the weight

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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!