Three boats are each being pulled by one rope connected to the smallest boat (in a line). The weight of each boat starting with the one farthest from the pulling force: 30kg, 20kg, 10kg. The force is 190 N that is pulling them. What is the acceleration of the system and the tension in rope

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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!