如果我从100米的楼上跳下去，无重量时间大概是4。5秒，忽略空气阻力不计。

If I jump from a tower which is 100 meters high I will be weightless for 4.5 seconds ignoring air drag.

youdao

如果我从100米的楼上跳下去，无重量时间大概是4。5秒，忽略空气阻力不计。

If I jump from a tower which is 100 meters high I will be weightless for 4.5 seconds ignoring air drag.

youdao