[填空题]
The carton shown in Fig. 4-55 lies on*khp,ffeis63 cbm m 5/ a plane tiltedfa fn t1wj.bn5n9 :lj; at an angle $\theta=22.0^{\circ}$ to the horizontal, with $\mu_{\mathrm{k}}=0.12$ . (a) Determine the acceleration of the carton as it slides down the plane.
(b) If the carton starts from rest 9.30 m up the plane from its base, what will be the carton's speed when it reaches the bottom of the incline?
