The daughter has a weight of 500N and is sitting 2.0 meters to the left of the pivot.Her father has a weight of 800N. How far to the right of the pivot should he sit so that see-saw is balanced?(moment of a force = force x perpendicular distance from the pivot)

An athlete of mass 50kg runs up a hill.The foot of the hill. The foot of the hill is 400 meters above sea-level. The summit is 1200 meters abvove sea-level.By how much does the atlete's g.p.e. increase? Assume that acceleration due to gravity g =10m/s².(change in g.p.e.= weiht x change  in height)

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