s=7t^3-3t

(a)Find the velocity and acceleration as functions of t.

v(t)=

a(t)=

(b) Find the acceleration after 7 seconds.

_______m/s^2

(c) Find the acceleration when the velocity is 0. (Round the answer to one decimal place) _______m/s^2

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- Feb 12th 2008, 12:03 PMplstevensThe equation of motion of a particle, where s is in meters and t is in seconds, is gi
s=7t^3-3t

(a)Find the velocity and acceleration as functions of t.

v(t)=

a(t)=

(b) Find the acceleration after 7 seconds.

_______m/s^2

(c) Find the acceleration when the velocity is 0. (Round the answer to one decimal place) _______m/s^2 - Feb 12th 2008, 01:11 PMCaptainBlack
- Feb 12th 2008, 05:01 PMplstevens
so what do i do for b and c

- Feb 12th 2008, 05:41 PMtopsquark
- Feb 12th 2008, 05:50 PMplstevens
i don't mean to be a dumby but i still don't get it

- Feb 12th 2008, 06:45 PMtopsquark
- Feb 12th 2008, 06:47 PMplstevens
I'm so sorry but thats not making sense

- Feb 12th 2008, 06:54 PMtopsquark
In part a) your position function is given as $\displaystyle s(t) = 7t^3 - 3t$. From this you get that the acceleration function is

$\displaystyle a(t) = 42t$

What is the value of a(7), the value of the function a(t) when t = 7?

If you can't answer that, then I suggest you have a long talk with your instructor.

-Dan