s(t)= -16t^2 + 400t + 5
What is the Instantaneous Velocity after 8 sec?
I'm not exactly sure what to do..
Hello civiliamThe velocity at any instant is given by the value of $\displaystyle \frac{ds}{dt}$ at that instant. So you need to differentiate your function (are you OK with that?), to get a formula for $\displaystyle \frac{ds}{dt}$ in terms of $\displaystyle t$. Then plug in the value $\displaystyle t = 8$. (You should get the answer $\displaystyle 144$.)
Can you complete it now?
Grandad