Alisa arrived at her new condo, her stuff in the box that is 50 kg in the corridor of the building then she need to push it on the front of her unit, she push it in the force of 80 N to make it in the front of the door the speed was 15.0 m/s, so what is the acceleration of the box before it arrived in front of the unit?

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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!