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An object moves in two dimensions according to
r⃗(t)=(4.0t2−9.0)i⃗+(2.0t−5.0)j⃗\vec{r}(t) = (4.0t^2 - 9.0)\vec{i} + (2.0t - 5.0)\vec{j}r(t)=(4.0t2−9.0)i+(2.0t−5.0)j
where rrr is in meters and ttt in seconds. When does the object cross the xxx-axis?
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