The box slides down the slope described by the equation y$=(0\mathrm{.}05$x$2)$y$=(0\mathrm{.}05$x$2)$ mm$,$ where x is in meters.

a$)$ If the box has xx components of velocity and acceleration of vxvx $=-4$ m$/$sm$/$s and axax $=-1\mathrm{.}0$ m$/$s$2$m$/$s$2$ at xx $=4$ mm$,$ determine the yy component of the velocity of the box at this instant.

Express your answer to three significant figures and include the appropriate units.

b$)$ Determine the y component of the acceleration of the box at this instant.

Express your answer to three significant figures and include the appropriate units.