A 5.0 kg block at rest on a frictionless surface is acted on by forces F1 = 5.5 N and F2 = 3.5 N as illustrated in the figure below. What additonal force will keep the block at rest?

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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!