- #1
betsinda
- 12
- 0
Homework Statement
The postion of a particle is given by s=2t^2-9t^2 where t is in seconds and s in meters
a) when is the particle speeding up/slowing down
Homework Equations
The Attempt at a Solution
I have calculated the
1st derivative (velocity) as 6t^2-18t
2nd derivative (acceleration) as 12t-18
and I know that the particle is speeding up when the velocity and the acceleration have the same sign and slowing down when they have opposite signs. However I am not sure how to express this to answer the question.
Thanks