Q$3.$ The cable is pulled at P with a speed of $v_P=0\mathrm{.}1t^2\frac{m}{s}$ as shown, where $t$ is in seconds. The block B moves with a constant speed of $0\mathrm{.}5\frac{m}{s}$ starting from rest. Determine the relative velocity and the relative acceleration of the block A with respect to the block B at $t=2$ seconds. $($Show your results as Cartesian vectors or report the magnitudes and directions separately.$)$