1:13 AM
@MartinSleziak It would definitely get more attention on meta, so yeah, I'd say that's probably a good idea. I think it should be fairly uncontroversial to merge into , but I think it'd still be good to open it up to the community just in case there's some counterargument that someone else thinks of.

1:49 AM
Please note that we don't answer homework or worked example type questions. Please see this Meta post on asking homework/exercise questions and this Meta post for "check my work" problems. — John Rennie 19 hours ago
Can you help me?
-1

(a) (b)Using first derivative test, $$\frac{dz}{dt}=0.$$ We get $t=2/3$. When $t=2/3$ object move $z=4/27$ units far from $z=0$. (c) Velocity at which object departed from $z=0,$ $$\frac{dz}{dt}|_{t=0}=0.$$ Am I correct? What about the velocity at which it return? Is it \frac{dz}{dt}|_{t=1...