[填空题]
A 21.7-kg child descends a slide 3.5 m high and reaches the bottom with a d xn)0 /qwugu)uyv/-wsp-mtzhd1s+05 /c va3(i u:rvw dupwr:feed of 2.2m/s- :3 zdvrhc1m a:0pi+/dvs 5r( tfwwuu How much thermal energy due to friction was generated in this process? J
