问题描述：
the free fall of a heavy ball bearing released from rest at time
尤其bearing和rest是什么意思在这里是什么意思
Figure 3.16 shows the free fall of a heavy ball bearing released from rest at time t=0 sec
尤其bearing和rest是什么意思在这里是什么意思
Figure 3.16 shows the free fall of a heavy ball bearing released from rest at time t=0 sec
问题解答：
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