After his journey from abroad, Richard Jones returned home, ______ .
A:energetic
B:confirmed
C:exhausted
D:independent
Talk quietly.
如图甲所示,高为h的光滑斜面上,一物块从顶端A点由静止自由滑到底端B点,在此过程中,物块的机械能 ____(选填“守恒”或“不守恒”);图乙所示的图象表示该物块的 ____ (选填“动能”或“重力势能”)随高度变化的规律。