An object is being pushed by exactly two forces, yet it's velocity does not change! The first force has a magnitude of 34.2 N and a direction of 3.2 degrees counterclockwise from the positive x-axis. What is the magnitude and direction (counterclockwise from the positive x-axis) of the other force. Give your angle between +180 and -180 degrees.

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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!