Two forces are simultaneously acting on a 5.0 kg object on top of a frictionless surface. The forces are 15 N upward and 16 N to the right, yielding a net force shown in the figure. What is the magnitude of the acceleration of the object and what is the angle θ?

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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!