Eric Nicholas K's answer to kelvin's Junior College 2 H2 Maths Singapore question.

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Eric Nicholas K
Eric Nicholas K's answer
5997 answers (Tutor Details)
1st
It takes observation to see that v d2v/dt2 + (dv/dt)2 is the same as the derivative of (v x dv/dt), which in turn comes from half the derivative of v2.