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Two slants with the same height, mass and different obliquity are located on a smooth surface of a plane. The slant is also smooth. Two same objects slide down on the slant from the top and from the rest, the we have ( ).A.
（A）The momenta of tow objects are equal at the bottom end of the slant.
B.
（B）The kinetic energy of two objects are equal at the bottom end of the slant.
C.
（C）For the system composed of the objects and the slant (and Earth ), mechanical energy is not conservative.
D.
（D）For the system composed of the objects and the slant , the momentum is conservative.
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