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7:10
YouTube
3minutemaths
How to calculate direct proportion
How to work with direct proportion is aimed at around grade A / B at GCSE. The video deals with calculating 'k' - 'the constant of proportionality.' There is an example of an A grade question: "Winnie drops a stone down a well. The spped of the stone, v m/s, is directly proportional to the time, t seconds, since she dropped it. After 0.5 ...
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