如图所示,有一重力不计的带电粒子以动能E0从平行板电容器的一端

如图所示,有一重力不计的带电粒子以动能E0从平行板电容器的一端水平射入,正好以E1=2 E0的动能从电容器的另一端射出.如果该粒子水平入射的动能变为4 E0,则射出该电容器时的动能E2
A.5 E0    B.4.5 E0    C.4.25 E0    D.5.5 E0

答案

C

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