How to Solve an Old Speed/Trajectory Problem When Standard Methods Fail?

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What is not working?

The attachment reads -

[tex]\vec{r} = A (1 m/s)t\hat{x}\,+\,A[(1 m/s^3)t^3-6(1 m/s^2)t^2]\hat{y}[/tex]
 
yes, but i can't seem to solve the questions it asks :P
 
bump ... help please !
 
HeLLz aNgeL said:
bump ... help please !

Did you take the derivative of [tex]\vec{r}(t)[/tex] to get [tex]\vec{v}(t)[/tex]? What did you get?