An object acted on by three forces moves with constant velocity. One force acting on the object is in the positive x-direction and has a magnitude of 6.4 N; a second force has a magnitude of 4.5 N and points in the negative y-direction. Find the magnitude of the third force acting on the object. Find the direction of the third force acting on the 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!