A 4kg object is moving across a friction less surface with a constant velocity of 2ms-1.The force necessary to maintain this state of motion is
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Zero Newton
According to Newton's First Law of Motion, the 4 kg object continues its uniform motion along the frictionless surface as a straight line with a constant velocity of 2 m/s, until an unbalanced external force is acting on it.
Thus a non - zero force can change its state of motion, so to maintain the state without any change, no force should act on the system. Hence 0N force is the answer.
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