A particle has position vector $r = 2 t i + t^{2} j$ metres at time $t$ seconds. Find its speed when $t = 3$ .

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Particles of mass $3$ kg and $5$ kg hang on either side of a smooth light pulley and are released from rest. Taking $g = 9.8$ m/s $^{2}$ , find…

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A particle has position… | A-Level UK (AQA, Edexcel, OCR)