On a see-saw Mary, weight 600N balances John, weight 200N when she sits 1.5m away from the pivot. How far from the pivot is John?

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Using the knowledge that the moments are balanced, we can create an equation to calculate the distance John is from the pivot:

600N*1.50m = 200N*(distance)
(600/200)*1.5 = distance
distance = 4.5m

Alexander N. GCSE Physics tutor, IB Physics tutor

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