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in Physics by (69.9k points)

On’a see-saw, two children of masses 30kg and 50kg are sitting on one side of it at distance 2m and 2.5m respectively, from its middle, where should a man of mass 74kg sit to balance it?

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 Let the two children be sitting on the left arm. They will produce anti-clockwise moment due to their weights about the middle point. 

Total Anti-clockwise moment = 30kgf × 2m + 50kgf × 2.5m 

= 60kgfm + 125kgfm = 185kgfm 

To balance it, the man should sit on the right arm (to produce clockwise moment). Let his distance from the middle be x m. Then

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