A body of weight w is attached by a string of length L, to a hook on a vertical wall.  A horizontal force F acting on the body holds it at a distance d from the wall.  Derive the equation, which gives the force F in terms of w, L, and d.

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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!