February/March 2026 Paper 12

2026 · 40 questions · 40 parts · 40 marks

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13Moments Equilibrium Centre MassMedium1 mark
Two children are balanced horizontally in equilibrium on a plank.
uniform plank of mass 7.0 kg and length 3.0 m resting on a central pivot; child X (mass 20 kg) sits on the left at distance x from the pivot and child Y (mass 15 kg) sits on the right at distance y from the pivot
The plank is uniform with a mass of 7.0 kg and a length of 3.0 m. There is a pivot at the midpoint of the plank. Child X has a mass of 20 kg and is distance from the pivot. Child Y has a mass of 15 kg and is distance from the pivot. What is the value of the ratio ?