A-LevelMathematicsMechanicsOct/Nov 2019Paper 4 Q69 Marks
A particle of mass 0.4 kg is released from rest at a height of 1.8 m above the surface of the water in a tank. There is no instantaneous change of speed when the particle enters the water. The water exerts an upward force of 5.6 N on the particle when it is in the water.
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