[填空题]
Two point charges arluvj*2sby)i-c j;rly73 kg 6 qe fixed 4.0 cm apart fromjajn9 jp9uy1+9d : tiw5/fupd each other. Their charges are $Q_1$=$Q_2$=$5.0\mu C$, and their masses are $m_1=1.5mg$ and $m_2=2.5mg$
(a) If $Q_1$ is released from rest, what will be its speed after a very long time? m/s
(b) If both charges are released from rest at the same time, what will be the speed of $Q_1$ after a very long time? m/s
