When a constant force is applied to an object the acceleration of the object varies inversely with its mass when a certain constant force acts upon an object with mass 20 kg the acceleration of the object is 2 m/s^2 when the same force acts upon another object it’s acceleration is 4 m/s^2 what is the mass of this object

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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!