Lets Cross The Axis
Classical Mechanics
Level
2
An object moves in two dimensions according to
\[\vec{r}(t) = (4.0t^2 - 9.0)\vec{i} + (2.0t - 5.0)\vec{j}\]
where \(r\) is in meters and \(t\) in seconds. When does the object cross the \(x\)-axis?
by
Danish Ahmed