A-LevelMathematicsDifferential equationsMay/June 2018Paper 3 Q68 Marks
In a certain chemical reaction the amount, x grams, of a substance is decreasing. The differential equation relating x and t, the time in seconds since the reaction started, is dx/dt = -kx/√t, where k is a positive constant. It is given that x = 100 at the start of the reaction.
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