题目:
忽略空气阻力,下列物体运动过程中满足机械能守恒的是( )
A.电梯匀速下降
B.物体沿光滑斜面加速下滑
C.物体沿着斜面匀速下滑
D.物体在竖直平面内做匀速圆周运动
答案:
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:The United Kingdom of Great Britain and Northern Ireland consists of England, Wales, Scotland and Northern Ireland, with a total area of 244,820 square kilometers and a...