Motion problems: when a particle is speeding up | AP Calculus AB | Khan Academy

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The position of a particle moving along the x-axis is given by s(t)=t_-6t_+9t. Sal analyzes it to find the times when the particle is "speeding up.". Created by Sal Khan.

AP Calculus AB on Khan Academy: Bill Scott uses Khan Academy to teach AP Calculus at Phillips Academy in Andover, Massachusetts, and heÕs part of the teaching team that helped develop Khan AcademyÕs AP lessons. Phillips Academy was one of the first schools to teach AP nearly 60 years ago.

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Very nice explaining.. I'm from Brazil, and I'm not fluent in English. But the way that you say and show, the process of learning looks easier.. And more, with your videos I can inprove my English also.. Keep in this way. You videos are all awesome! Greetings from Brazil...

gnizto
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This really helped me on my science work like for real!

mercyndegwa
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At 3:09, how did you go from 1st equation to 3t^2-12t+9?

MrSpittaz
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i have an equation s(t) = =3t^2-15t
t>=0 and i ant to know that when the particle is speeding up and slowing down

AnkitVerma-brcf