As long as the 20N force keeps pushing, its acceleration is 50/20 = 2.5 m/s² .
But as soon as the force stops pushing, the object stops accelerating. It continues on from there at constant speed in a straight line.
The acceleration of a 50 kg object given a 20 N push is 0.4 m/s² according to Newton's Second Law of Motion. This formula relates force, mass, and acceleration. If the force ceases, the object will maintain a constant velocity afterward.
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