burhan101
Velocity = 9t²81t+162
At what time,t, is the velocity not changing?



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ganeshie8
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find its vertex

julian25
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but really the velocity is not changing there?

ganeshie8
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dw:1371752495017:dw

burhan101
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0= 9t²81t+162 ? @ganeshie8

julian25
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yes the rate of change there is 0

ganeshie8
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@burhan101 look up formula for "vertex of parabola"

ganeshie8
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vertex occurs at \(\frac{b}{2a}\)

ganeshie8
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a = 9
b = 81
just plugin

burhan101
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x=9/2

ganeshie8
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correct ! thats the time when verlocity becomes 0

ganeshie8
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*velocity

burhan101
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4.5