So its very smooth very flat ice and you push a sledge on it and then you let go, what happens? The sledge keeps going. How can that be?

冰面很光滑，你推动雪橇，然后放手，接下来会怎样呢，雪橇仍然会继续前进，为什么会这样呢？

youdao

So its very smooth very flat ice and you push a sledge on it and then you let go, what happens? The sledge keeps going. How can that be?

冰面很光滑，你推动雪橇，然后放手，接下来会怎样呢，雪橇仍然会继续前进，为什么会这样呢？

youdao