There is a sand sliding field next to Mingsha Mountain in Dunhuang City, Gansu Province, which can be used for sand sliding. The following figure is a simplified schematic diagram of the sand sliding

There is a sand sliding field next to Mingsha Mountain in Dunhuang City, Gansu Province, which can be used for sand sliding. The following figure is a simplified schematic diagram of the sand sliding field, and the whole sand sliding track consists of an inclined main track. (1) The speed of an athlete from A to B is V, and the kinetic energy theorem is as follows:

mgSsinθ？ μmgScosθ= 12mv2。

Get: v = 2gs (sinθ？ μcosθ)

Alternative data: v = 20m/s.

(2) For the whole process research, according to the kinetic energy theorem, there are:

mgSsinθ-μmgScosθ-μmgSCD=0

Get: SCD=sinθ？ μcosθμS

Alternative data: SCD =10033m = 57.7m. 。

Answer: (1) The speed of athletes descending from point A to point B is 20m/s. 。

(2) The distance for athletes to slide on the horizontal sand track is 57.7 meters.