일반물리학 1 — Motion in Two and Three Dimensions: Problem 15

15 From the origin, a particle starts at \(t = 0 \text{ s}\) with a velocity \(\vec{v} = 7.0 \hat{i} \text{ m/s}\) and moves in the \(xy\) plane with a constant acceleration of \(\vec{a} = (-9.0 \hat{i} + 3.0 \hat{j}) \text{ m/s}^2\). At the time the particle reaches the maximum \(x\) coordinate, what is its (a) velocity and (b) position vector?