[填空题]
The carton shown in Fig. 4-55 lies+pb cllm 2;mof6y( r( 6uod0c bnu;th9 on a plane yk kji27rld/(l xd69ptilted 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?
