而第二个例子中，用一辆车撞另一辆，后一辆质量是它的二倍-，不知道速度多大-，现在我们得到什么？
The second case, I bounce one car onto another one - which is twice the mass — - certain velocity which I don't know what it is — and now what are we going to get?
不为0，为0的是重量，This，is，weightless，，here，your，weight，is，double,这里是零重量，这里是二倍重量,这里是正常重量，这里是二倍重量,然后又是新的一轮,自由落体。
g here your weight is normal, here your weight roughly doubles and you go into another free-fall period and the cycle from here to here is about 90 seconds.
不为0，为0的是重量，This，is，weightless，，here，your，weight，is，double,这里是零重量，这里是二倍重量,这里是正常重量，这里是二倍重量,然后又是新的一轮,自由落体。
g here your weight is normal, here your weight roughly doubles and you go into another free-fall period and the cycle from here to here is about 90 seconds.
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