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Differentiation

Asked by Butterflywing | Jul 9, 2007 | GCSE Level > Physics > Revision
Butterflywing
Butterflywing asks:

A car moves such that its displacement, s metres, at a time t seconds is given by the formula s=14+9t²-t³. Find the maximum velocity of the car.

I know that ds/dt = velocity = 18t - 3t²

But how do I calculate the maximum velocity?

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