February/March 2026 Paper 12

2026 · 40 questions · 40 parts · 40 marks

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5KinematicsMedium1 mark
The water surface in a deep well is 78.0 m below the top of the well. A person at the top of the well drops a heavy stone down the well. Air resistance is negligible. The speed of sound in the air is 330 m s. What is the time interval between the person dropping the stone and hearing it hitting the water?