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A horizontal plank is 10.0 m long with u...

A horizontal plank is `10.0 m` long with uniform density and mass `10 kg` .It rests on two supports which are placed `1.0 m` from each end as shown in the figure. A man of mass 80 kg can stand upto distance `x` on the plank without causing it to tip .The value of `x` is

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