Force is not needed to keep the 2-kg object moving horizontally with a speed of 4 m/s according to Newton's first law. Hence we can say that 0N force is required.
The Law of inertia or Newton's first law of motion states that a body will continue in its state of rest or sate of uniform motion unless it is acted upon by an external force.
Hence, once a body has been set in motion, it will continue to move with the same speed, along the same direction indefinitely.
From this law, we can see that, we can say that 0N force is required to keep the object moving at this speed and in this direction .
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