更正.......莫名其妙用太多式子了...
= =;;
直接用energy算
.... 我明明就可以直接算 E=qV , E=1/2mv^2
1/mv1^2 qV1
-------- = -----
1/mv0^2 qV0
v1^2
------- = 2
v0^2
v1
---- = sqrt(2)
v0
v1 = v0 * 1.4ish
v(t) = x
x 不變
time = 原來的時間除以 sqrt(2)
....
好啦 答案還是一樣的 XD
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