A child walks due east on the deck of a ship at 3 miles per hour. The ship is moving north at a speed of 14 miles per hour. Find the speed and direction of the child relative to the surface of the water. Speed = The angle of the direction from the north = mph (radians)

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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!