A bridge of length 49 m and mass 80000 kg is supported at each end. A truck of mass 34700 kg is located 21 m from the left end. What is the force on the bridge at the left point of support? The acceleration of gravity is 9.8 m/s2.

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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!